Defog your windows TWICE as fast using SCIENCE- 4 easy steps

Here are 4 steps to defog your windshield twice as fast in the morning and the science behind why it works. Thanks for watching from the bottom of my nerdy heart.
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[@Pulsarstunes]

There's another thing that really helps: the condensation that's there in the morning, comes from the water that was present in the hot air in your car when you got out last night. All you need to do is to leave the windows or doors open for 30 seconds when you get OUT of the car, so it's cold inside, before you close the doors. That way the problem will be five times smaller tomorrow morning to begin with :)

[@bballhead111]

open all four doors for a minute

[@chrismartin1318]

This assumes that it won't get colder in the night.

[@EmronWalker]

@@chrismartin1318 the goal is to cause less condensation to build up… not necessarily to cause it to be non existent. Most places that deal with the condensation are a situation where they are driving around with the heater on, and it is much colder outside. He’s just saying to leave the doors open a bit so it’s not so hot in the car compared to outside.

[@chrismartin1318]

@@EmronWalker I realize that. But as an HVAC tech who does this for a living, I can say that often times if the car is parked when the sun is out then driven again early the next morning there is a usually at least a 10-20 degree difference. This difference is usually significantly greater than any change in just opening the doors and equalizing the humidity with the outside. Another factor to consider is that if it's raining you'll actually be putting more humidity into the vehicle due to the humidity outside being near or at 99%. Humidity changes outside quite often during the night and not necessarily in a direction that would be beneficial to this method.

[@alanbrown2666]

But the ice forms on the outside of the vehicle, the conditions outside don't know what's going on inside

[@Affalterbach1967]

Step 5: turn on the fan to loud because it scares the water away.

[@milkshakeflake]

Roar

[@Trevor_M_F]

Thats how I still choose to see it. It works

[@Angie_978]

And yet you're here, with the rest of us. You know that commenting, even negative comments, helps his channel, right?

[@desertodavid]

@@Angie_978 I just came across this channel the other day. So, no I won't be here with the rest of you. The guy is smart. I just don't like his effeminate mannerisms, that's all. And by the way, negative comments do not help his channel. It's why a lot of KZbinrs get suspended when they draw too many complaints.

[@mdowney2740]

Moving...not easier.

[@mrosskne]

In case you were wondering, shaving cream has detergents, which reduce water's surface tension - so water is still condensing on your windshield, but it's forming a sheet instead of discrete droplets, so it appears transparent. The detergent molecules have hydrophobic ends, which interfere with water's hydrogen bonds, resulting in lower surface tension. Thus, any detergent or substance with similar chemistry will work; shaving cream is just easy to apply, highly available, and cheap.

[@mggt4684]

And last shorter then anti-fog spray

[@higbeedoug]

So this phenomenon is the same thing as Rain-X has on the outside of the window?

[@KassiusFineArt]

I like you.

[@jama211]

@@mggt4684 depends on the brand, but it's probably at least cheaper.

[@twothumbsfresh]

Does this mean that the condensed water will probably run off, potentially down the back of my dashboard? Or just not stick to the window in the first place? I don't want to simply "move" the problem 🤔

[@mattsaid]

What my engineering professor tried to teach me in a semester of thermo, Mark Rober simplified in a 5 minute video. Thanks Mark, that gatorade + towel analogy is top notch!

[@TheBackyardScientist]

I discovered an even easier to defog your windows.. Move to Florida!

[@realrainbow4983]

TheBackyardScientist lol

[@AlphaBetaParkingLot]

Yeah, but then you have to live in Flordia.

[@carterlam3524]

TheBackyardScientist I love your videos!:D

[@sdw8036]

TheBackyardScientist ωψζαγπλμθτε

[@nouraldeensaeed6086]

TheBackyardScientist with Irma and everything you sure won't have any windows to care about in the first place

[@TyM07]

I freaking love this guy Edit: Taught me Science and roasted the Kardashian’s.

[@-zen-5409]

Ty M the 2 most important things 😂😂

[@VortechBirb]

She spelled responsible wrong

[@MiniNinja258]

SamTheMan9805 really?

[@adamhurst5027]

Gundor Stoneskin What? Is it supposed to show a message or something?

[@JCA122510]

Tajwar Morshed the government has patents for high altitude aerosol spraying. Look it up.

[@ryPish]

Thank you for identifying the mysterious blue liquid they use in ads for menstrual pads.

[@CaptainCocaine]

+Ry P I thought girls just had blue pee.

[@idrisisa3236]

+Mark Rober are you in america or uk btw nice to see a new video

[@drewcurley]

+Idris Isa i think he lives in utah

[@idrisisa3236]

Drew Curley in the what???

[@CaptainCocaine]

Idris Isa Utah is in the western US

[@mattegeniet]

This is close to what I use, with a slight variation. I find that when just starting the engine, and for the first few minutes of driving, the engine is still so cold that where you put the temperature knob doesn't really have any affect on the temperature. However the airflow goes down when putting it on max heat as all the air has to be passed through the heating element. By putting the heat at 2/3rds of the way up for the first minutes you get more air flow (thing passing through more towels at higher rate) and since at this point the temperature (size of towel) is still the same anyway, this is more effective. Of course, as soon as there is any heat coming through from the engine (say after driving for 2-3 minutes) you should quickly put it at max heat. Also another benefit of having the AC on is that it puts slightly more strain on the engine, which should make it heat up more quickly. But of course the fastest way to heat the engine in general is to just drive the car. Another thing is to not sit in the car before starting the engine and blasting the fan to avoid fog in the first place. Especially if there's more than one person in the car.

[@nottheengineer4957]

Some cars have electric heaters that work as soon as the engine runs. And they also ruin the battery, which is coincidentally sold by the same people selling cars.

[@MarcosLopez-ky5yg]

Wait, how are you driving for 2-3 minutes with fog on your windshield?

[@brandonhoover2120]

How do you drive for a few minutes out of a window you can’t see out of?

[@Mike-tv9rk]

So you start driving with your windows still fogged?? What time do you leave for work so i can keep my kids indoors !

[@lucidman420]

Why does it say defrost when hes talking about defog

[@Mandrew_]

Americans are weird.

[@TheBanjoShowOfficial]

It says defog. Maybe he changed it?

[@dylanjoggerst5880]

@@Mandrew_ Bro

[@Mandrew_]

@@dylanjoggerst5880 im not your bro and prove me wrong.

[@Hermit_Wish]

@@TheBanjoShowOfficial the thumbnail says defrost

[@otgdaily2660]

Another one that works the best is silica gel packs like the ones found in new shoes and purses. Just a couple left on the dash over night prevents almost all of the fog off the window plus recycling is never a bad thing my daughter and I both love this channel. Keep that energy Mark.

[@mrawesomepossum16]

In Canada you can't always open your windows cause 90% of the time the windows are frozen shut

[@natylevai7619]

Darin Hawrylak Open a door

[@jasondashney]

Those freeze too! Almost every day this week I've had to use something to gently pry my door open because there was melted snow on the door seals, then it freezes overnight

[@launchpad97]

Darin Hawrylak plus if you open your window you risk getting eaten by polar bear

[@jasondashney]

Steve reefer And of course there's that.

[@johncrafton8319]

This is why I park in my garage. No melted snow (or snow of any kind) to freeze my doors or windows shut. It's a must for Minnesota living.

[@7yorker7]

Wow, I live in Iceland and we have a lot of snow and frost. I tested defrosting my car a few years ago and I have to admit that I use the same technique you presented here (without opening my windows though) and it works every time. I also have 4 socks full of cat sand in my car. Next winter, I’m going to try your advice and open car windows.

[@edguix]

how is the advice coming along?

[@7yorker7]

@@edguix, we had a very wet winter, and when frost came, I hadn't been able to open any window in my car. Now it's the storm season, so the wind is too strong. In other words, this technique works like a charm when the frost is moderate or when it's raining outside.

[@thephantom1492]

@@edguix For me, in freezing land of canada, the best setting depend on how hot the engine is. The engine is too small and do not produce enough heat at idle. If I just started the engine, the best is: hvac off, wait a few minutes, hvac to 3/4 and windshield only. The car force the A/C to be on and recycle forced off. If the engine is already hot, full blast and windshield only. I hasn't found that opening the window made a significant difference EXCEPT if you warmed the inside (hot air at the feet) as it increase the humidity way too much (due to melted ice = water, hot water = humidity). After all, you are pulling mostly outside air. in other words, hotter air is better than more air.

[@JB-yb4wn]

@@thephantom1492 Spoken like someone who actually knows what ice encrusted windows look like in the hinterlands of Canada. I do exactly the same thing. 👌

[@jacobb4357]

You can thank my dad for the adhesive bonding chemical in cat litter, he invented it back in the 80s

[@reclaimer3439]

I see what he did there. He used Shaving cream to... shave a few minutes off his commute XD

[@mike1024.]

Why can't I like this more than once?

[@samson03]

@@mike1024. If you press the dislike button you can like it again. Hope this helps^^

[@fc192shibism3]

@@samson03 lol

[@FergusDoyle99]

@@samson03 qqqq

[@Bob-gn6pr]

@@samson03 so helpful of you

[@ezrakainz]

Summary: 1) Full Heat 2) A/C On 3) Recirculation Off 4) Let as much outside air as possible into your car

[@grimytech]

Cheers

[@pamelasuemoreland3315]

Dose that really work my windows have ice on windsheild

[@zleggitt1989]

@@pamelasuemoreland3315 in my experience no cuz I've literally tried this many times before and the cold air from the outside chills the hot air from the defroster

[@tomsetlock7380]

Yeah I do that in my house to I take all the 32 Degree air from outside and heat it up to 72 degrees😎

[@YoStu242]

And then wonder why lower part of the windshield is full of cracks

[@Hey_Jamie]

You said “big, dry towel” and I literally thought you were just about to tell me to just wipe it off with it lol

[@AdamHallacher]

but like why can't u do that lol

[@guitarman0365]

@@AdamHallacher because fog builds up between the panels of glass as well. The defroster allows the ice to melt on the outside of the windshield, gets rid of fog on the inside of the vehicle but there is moisutre build up that you cannot just wipe with your hands or a towel that needs the defroster only to go away. I mean try it with a towel not much will change because you are not actually wiping away most of anything. The inside of the cab can be completely clean but still have fog everywhere else.

[@AdamHallacher]

@@guitarman0365 ohhhh

[@markfox1545]

You literally thought that, did you? How is that different to thinking it? Do you mean literally thinking as opposed to figuratively thinking? How does that work?

[@markfox1545]

@@AdamHallacher - 'like why can't you do it'? So...why can't you do that, you mean then, yes?

[@b.schurman]

If you are in a cold climate and are able to, I would also suggest leaving the door open for an extra couple of minutes when you get out. This should equalize the moisture content to the temperature at your destination.

[@JB-yb4wn]

Yeah, that will work at -20 on a cold Montreal morning. 🤣

[@b.schurman]

@@JB-yb4wn I'm in SK. Obviously this is only for when you will be away from your vehicle for a somewhat extended period of time.

[@BattleCattleSA]

you slammed a car door on an electrical cable and i will never get over it.

[@thefox5997]

I, too, cringed at this.

[@isvack]

Not like anything will happen.

[@nomusicrc]

M C I’m glad I’m not the only one that noticed that

[@Cobra_Khan]

Are you over it yet?

[@ellieblunden1463]

Why? Literally nothing would happen to the cord or door.

[@caleblimb3275]

I tried to grab fog, but I mist.

[@stevenrandall34]

+Mark Rober clearly you soaked up the win against Caleb Limb

[@AtlasMays]

I'd try to make a pun, but I don't want to sound condensating.

[@kozzymoto8994]

I wanted to reply, but I fog-ot what I wanted to say

[@Bowfinger6383]

I would say something, but, this thread is already saturated.

[@Tiny_24]

What the fog?! So many puns I mist the point...

[@alexstgeorge]

There seems to be some confusion here between "de-frosting" and "de-fogging" / "de-misting"...

[@mspenrice]

Well, usually the latter on the inside go hand in hand with the former on the outside... so it kinda gets lumped together. When you have to defrost the inside of the car (which I've had to do maybe twice before) you know things have got truly serious. All the same, this method will still help you to do THAT faster as well (warm, dry air will assist the ice in both melting into water and subliming into vapour)

[@Grakoham]

mspenrice where I live pretty well every time I get into my car in the winter there is frost on the inside of the windshield. It’s really common anywhere even remotely northern.

[@mspenrice]

Define "remotely northern". I live somewhere that's considered by some to be at least technically in the north of the country, but it's "only" about 53 degrees above the equator. Which is enough for decently wide swings between summer and winter (like 50'C / 90'F between the highest heat and the deepest cold)... I've only seen frost on the inside of the car when the temperature has dropped somewhat from near freezing to double digit negative celcius, ie so there was still SOME moisture in the air, which then ran into an extremely cold piece of glass that froze it in place instead of spreading it out into a still-technically-liquid misty covering...

[@Grakoham]

mspenrice it depends on how many people you have in ur car, since more people brings more snow in, which melts and then condenses on the windows and freezes. As far as remotely north I should have said anywhere where in winter it’s below freezing consistently. Doesn’t really matter

[@mspenrice]

We regularly have winters where it can be subzero for weeks on end... still only seen it happen 2 or 3 times. Also, the frost I'm talking about is already on the inside of the screen when you get into the car... and wouldn't more people cause the interior to warm up faster? I guess what I'm asking is where *you* are. No need to be exact, like, just general area of whatever country or state...

[@TheGameChallenger]

It's crazy how he had this amount of quality way back since 2016, Keep it up!

[@koppadasao]

Chemtrails are real! It just that most people don't realize that the chemical in chemtrails is a compound of 2 units of hydrogen and one unit of oxygen…

[@vinsanity1976]

+Koppa Dasao I see what you did there

[@zabe3187]

that pesky dihydrogen monoxide!

[@koppadasao]

Betzabé Nazario Yeah, it's nasty.

[@koppadasao]

***** Government? Well, when the engines were made of aluminium there may have been some aluminium particles to end up in the chemtrails due to wear and tear. So…, not government, just manufacture process.

[@koppadasao]

***** Oh, I see what you are talking about. Yes, there have been attempts at mixing asphalt in different ways to reduce the amount of heat stored in the roads in an attempt to reduce the environmental impacts of roads. So far the best solution was invented by the romans more than 2 millennia ago…, the substance called concrete…

[@jakemiller1467]

“Shaving cream to shave a few minutes off your commute” I see what you did there.

[@jubileeYAVEL]

*correction, Jurassic park shaving cream XD

[@bearmugs1408]

first time I watched this video I half expected it to be sponsored by a shaving company. Like Harry's

[@breadsnake4960]

For lazy people: max heat, AC on, outside air, windows cracked

[@jcl_piano]

For lazy people: drive with the fog

[@Shinigamie34]

Stick your head out the window xd

[@MXMLN69]

instructions unclear, my window is now shattered

[@Mike_The_Hog_A_Nator]

I have an 02' Blazer & defroster blows hard & hot but the windshield stays fogged up. My Controls only have A/C, or Heat. Unable to turn A/C on with Defroster on. It's one or the other. This problem just started. Defroster blows hard & hot but it does nothing to this windshield. I'm curious as to why. Normally hot air clears the windshield quickly.

[@ethanthai5148]

There are 420 likes so I can’t like

[@burkeiowa]

What I find helps the most is something you can do before the frost forms. Before you arrive at a destination, when you think you'll only have another 1-3 minutes in the vehicle, switch to cycling outside air and switch to the cold air settings, possibly with the A/C to dry it out even more, but I don't bother with the A/C. This drops the amount of moisture the vehicle's internal air can hold in the first place. If you run the fan on high, it can also get rid of much of the moisture you created in the vehicle by breathing in it. It also reduces the temperature difference between the inside and outside of the car, thus reducing the likelihood and amount of condensation. You're about to step out into the cold anyway, so you can reduce that shock on your system by quickly bringing down the temperature inside your vehicle. At the same time, you can greatly reduce the amount of frost/fog on the inside. It also greatly reduces the amount of ice that can form on the outside in the event of snow. If it's snowing and you ran the heat, the snow will melt as it lands on your windshield, until the glass cools enough to allow snow to remain frozen. But at that point, the liquid water from prior melting gets a chance to refreeze as cold air and snow touches it. I've often been able to avoid scraping my windshield of ice by running the defrost on cold for 1-3 minutes before getting out of my car. It brings the glass temperature down to prevent lots of ice on the outside (assuming it's snowing, rather than a freezing rain situation, where hotter glass could be useful), and has greatly reduced the amount of defrosting on the inside. I've done this for years. Then, any frost you do have can be dealt with as this video points out. Imagine if automakers would offer a feature that would cool the air inside the vehicle and cool the glass after you got out. That could be worth it.

[@zii0]

What if.... You used that big towel and wiped your windshield. 🤯 Great video btw, I learned a lot haha

[@Bob5mith]

That works great if you always bring a fresh dry towel, not so much with the towel you left in the car overnight.

[@CraftyBirdGirl]

lol I was thinking that. What if he taught us the science with the towel analogy and then just...used the towel xD

[@gundorstoneskin5900]

Just keep a rag in your car, voila.

[@lindylund280]

They say an eraser works well.

[@Gengh13]

You should never leave home without a towel.

[@shannonfox2987]

Let’s be clear, this is defogging, not defrosting.

[@galileaoruna871]

N o

[@indiana6941]

Yes

[@shatterednova_]

Yes, defogging is what the title says

[@JS-jt4fn]

*cries in canadian*

[@Rico_71]

@@JS-jt4fn tip: save a cup of hot/warm water from your breakfast coffee/tea and if your windscreen is frosted put said water in a clear bag (or ziplock bag) and pass it a few times on the windscreen.

[@valhallasashes4354]

Used the hot air with A/C trick for years to quickly defog the windows in my car. The only part where I differed was in the fresh air vs recirculated air. I always used recirculated air because I didn't find fresh air to be that much more effective than recirculated. I always found the A/C to have the far bigger impact on speed. Plus, most of the time I would have to do this, it was mostly in the winter. And at that time of year, getting the car "warm" so I could stop shivering always took priority first. So I always found hot recirculated air with the A/C to be the nice middle ground between warming up the car and defogging/defrosting the windows to be the most effective across all fronts.

[@deejaymanners]

yep, exactly like me, for me the recirculated works much more faster then the fresh air

[@joycehernandez9154]

Mark, keep doing what you do, this mom/gramma LOVES YOU and your inquisitive mind❣ We watch you as a family, beats mindless videos by a trillion, THANK YOU!

[@gabrielg4498]

My wife is mad at me, I cracked all the windows like you said with a ball peen hammer and now we can't see anything through them.

[@raventhorX]

Of course you cant see anything through them, they are probably shattered to pieces now.

[@zaneabrams7110]

@@raventhorX whooooosh

[@raventhorX]

@@zaneabrams7110 seems that goes over your head if you dont get the joke.

[@e.denzhang]

@@raventhorX The wooosh is the joke going over your head.

[@Otoskire]

A naughty mouse he literally just said that he was making a joke and that he got the og joke

[@turkeybowlwinkle4440]

Instead of simulating a large dry towel, use a large dry towel.

[@TheGameChallenger]

leaves marks (small bits of the water still not fully into water droplets being spread all over it.)

[@emac3628]

Ya I'll just put on my large towel helmet and climb in my large towel cannon and blast off to large towel land where they have all the large towels!

[@toastiesburned9929]

@@emac3628 right? Like where the f am I supposed to get a large dry towel?

[@Brave_Sir_Robin]

Water builds up in between the panels of glass

[@QuaabQueb]

Now make a video on how to deFROST :)

[@Twiztidguy]

+BuNNieSklZ He told you how to get rid of water the fastest in the already liquid state, not the solid state. It would be a different method for frost/ice.

[@drakono82]

+Twiztidguy Plus, frost is on the outside of the windshield, which is a much bigger factor than the state of the water. And humidity doesn't enter the equation. All you can do with the air system after the fact is throw heat at it. Any tips for prevention or removal would be radically different.

[@VincentJGoh]

+drakono82 Yeah, no. Frost happens both inside and outside of the car, depending on what state you left the car in. If it was warm and humid inside the car when you get out, and it was really cold out, you'll have frost on the inside of your windshield. It was like that in my car yesterday morning.

[@Hellbringer86Spades]

+Huangism rain-x makes a de-icing windshield fluid. it works quite well and adds the water beading effect. as for fog inside, just open your windows for a bit before you arrive at your destination. it should equal out the moisture that's been collected. i think anyways.

[@mrboni5]

use an old blanket to cover your windshield over night...in the morning all you have to do is remove the blanket and you are ready to go, simple as that

[@AnxKhn]

That's Mark's son in the video! Glad to watch it in 2021

[@Anne--Marie]

Isn't that awesome!

[@CupolaDaze]

So your video is about defogging windows but your thumbnail says defrosting. if you are defrosting your windows you would use different techniques. Don't open your window. You are trying to warm the iced windows till they melt. Also use recirculated air. It will be warmer and take less time for your car to warm it up again.

[@hughg10]

+Andy Cox I was thinking the exact same thing. Ice forms on the OUTSIDE of the window.

[@CupolaDaze]

His techniques for defogging are correct I think he just used the wrong wording in the thumbnail. BUT yes ice forms outside of the window. In that case you can still just scrape it off or wait for the air to warm up and let the ice melt.

[@giin97]

Precisely what I came to say, as well.

[@chrisransdell8110]

+Andy Cox Recirculating would give you warm air quicker but you are likely to get better defrosting at the expense of more fog inside the car.

[@VincentJGoh]

+Hugh Gilmartin That's not necessarily true. If you're in your car and breathing inside it so the air is warm and humid, then get out and leave it overnight when it's very cold, you'll get ice on the inside as well. My car had ice on the inside yesterday morning. It was -22C overnight, and I'd been breathing inside the car the day before, when it was only -10C. My breath condensed on the window after I'd gotten out, then froze.

[@jobethk588]

"Jurassic Park shaving cream." Smile. You verified that what my husband told me was scientifically accurate!

[@Chrnan6710]

The Rober Principle: If Mark makes a video, it goes viral.

[@jollyfellow1118]

+Mark Rober I see what you did there! Also, while you're here, on a water bottle rocket, are long fins, or short fins better, do you want it to spiral, and what is the best ratio? I would like to see a video on it, or, if you don't want to do one on that, then you could just reply, which I would be just as happy about! Thank you!

[@Chrnan6710]

+Mark Rober :D a reply from mark

[@jollyfellow1118]

***** Thanks for answering! I have (basically) already done so, as I did it in my honors science class recently. Our rocket, which had three long straight fins, a screw on cone (as we had to put a payload in/on it), and was filled with 1/3 water, 2/3 air, and went the highest, compared to about 6 others which were each altered differently. I just wanted to see what you would say, as you worked for NASA. (Also, I gave my science teacher our rocket, and made a replica afterwards so I could work on it at home). Thanks again!

[@ProxCyde]

+Mark Rober Why do you keep saying "believer of the scientific method"?, this is only bait to any "non-believer" (using your terms) to argue that science is a set of beliefs. It isn't. We use the scientific method because, so far, it works. If some better method comes along, well then, we change it.

[@pssst3]

Scientific method = hypothesis, prediction and experiment. Strictly speaking experiment and observation without model, hypothesis and prediction isn't scientific because it isn't an effort to extend understanding, It IS, however, the basis of engineering, which is applying knowkedge of phenomena to produce desured results.

[@Biffiee]

Watching some archives, I liked how the style of your videos was pretty much the same 6 years ago, it was ahead of it's time. My car (2005 Nissan Primera for EU) actually turns on all the settings you mentioned- so max temp, AC on, outside air intake on - just when I press the heat windshield button. Really cool :)

[@ThatDataLady]

Mark Rober got me through freshman level physics and now he’s getting me to work everyday Wow 10/10

[@bronny5148]

Jurassic Park shaving cream! 😂👍🏻

[@pachma405]

Don't get cheap on me dodgson

[@4lifejeph]

Can you help me out with this reference pls?

[@pachma405]

@@4lifejeph kzbin.info/www/bejne/emWwhnWHg8eHj9E

[@4lifejeph]

@@pachma405 thanks dude. I haven't seen this movie in like 20yrs

[@desertwhaler]

@@4lifejeph If you haven't seen jurassic park yet... You need to drop everything now and go watch it.

[@thatgoose2639]

As a goose, i don't have this issue. Just grow a set of wings...

[@aepfelpfluecker]

Just do unfunny jokes...

[@joyson7]

Lol

[@AFrame06]

I tried that before, failed, went to the hospital, came out with just nubs on my back

[@RetchedKat]

I love geese. How's life as a goose?

[@stonedmountainunicorn9532]

I lost mine when i started smoking, now im always high

[@sambalarezo7497]

This guy really made a video to show his friends up....Respect

[@LuizNunes74]

This is really helpful. How about exchanging the inside air just before parking for the day/night? My thinking is that it will take humid air out and bring dry air in. Makes sense?

[@nickbisson8243]

Yup open up your windows 30 seconds before you pull in your driveway or leave your door open for a little bit when you get home to let the interior temp equalize.

[@twixles6297]

@@nickbisson8243 Are cars really that isolated? I would think the same thing happens over 16 hours in the driveway

[@nickbisson8243]

@@twixles6297 warm or hot air holds more moisture than cold air so by opening up your window 30 seconds to a minute before you get home removes most of the condensation that would condense on the inside of your windshield and ice over.

[@Droucko]

Pro tipp: Put down your sun visors too, so the hot air will circulate a bit longer/more near the window.

[@connorvickers2053]

Mark Rober: *HOW TO DEFROST YOUR WINDSCREEN EASILY!* Me, who lives in Australia: lol

[@connorvickers2053]

I know that, I live in South East Queensland and yeah it does get pretty cold but from where I am living it does not often fog up window screens

[@arcticsoulja]

Me who lives in Alaska.. takes note

[@FreezyAbitKT7A]

Gets cold in Taz and Adelaide

[@MotoCat91]

@@connorvickers2053 As another SEQ'er, I have experienced only 2 winters in my life that involved actual ice on windscreens.. A garage or even parking on concrete with a roof/shadecloth overhead is usually all it takes to prevent iced/fogged screens all winter First icing was at highschool in the early 2000's, in Noosa, my sister had a VL Commodore which she drove us both to school in. Somehow that winter got weird and the VL (parked on grass) got like a half cm thick ice over the windscreen. Her immediate thought was to grab the hose because what Australian even owns an ice scraper?.. well the hose snapped in 3 places immediately because it too was full of water and sitting on the grass. Step 2 was going to be boiling water from the jug which I -VERY- strongly advised against, instead getting some cold tap water to drizzle over it and it melted within a few seconds. Second one was in Warwick, which is far enough inland and has late sunrise due to mountains, so understandably cold winter mornings.. 2010, I rode a motorbike into class, wiping my visor with a glove a few times at the start and cracking it open when stationary was all it took to see ahead. Meanwhile one of the other students poured hot water onto the icy windscreen of his mid 90's Celica... turned up to class with a giant crack in the glass. And a group of students who carpool together turned up going less than half the speed limit, all of them hanging their heads out the windows shouting to each other about direction and obstacles like morons because they never bothered to de-ice it. Highlight of my day for sure. But anyways, since this vid is more about fog than ice - I've never really had that issue unless I parked on wet grass as above, and the worst case of internal fog was fixed with a quick wipe with a microfibre cloth.. which unlike using your sleeve is actually clean and doesn't leave streaks. One wipe before driving off is all it ever took.

[@valerief1231]

I remember the first time I heard the term windscreen (I’m from Texas) I was so baffled, like, “England had SCREENS on their car windshields?!? That’s AWESOME!” To be honest, I’m still pretty disappointed that it’s just a glass window. And what’s up with BOOT? Again being from TEXAS...🤠

[@RollingFishball]

This is so great! Not only now I know what to do but I can remember it because I know WHY!!!!! Hope all the teachers 20 years ago were like you!

[@murztufy6672]

Instead of going to school I will watch your vids

[@catkeys6911]

You may notice that A/C works, but only for a limited time, because a/c coming through the window vents also cools the windshield and can then cause condensation which will look like fog on the windshield in the areas right above where the vents are pouring out that chilled air.

[@umShiFT]

My air circulation button automatically turns off when I apply defrost windshield. Subaru knows haha.

[@mbmferguson]

What if you would rather circulate the air as opposed to defrosting faster?

[@jhobaugh45]

My Mazda also turns off recirculation with defog automatically!

[@UncleDon226]

If it's a new car (last 15 years or so) it will do this automatically. Humidity in the car is often higher than outside air, so manufacturers disable recirculation during defrost to prevent people from leaving it in this mode and complaining that it takes too long to defrost.

[@kyledefreitas8506]

@@mbmferguson then don't push defrost?

[@adamthompson4072]

My Volvo does too. But also turns on the a/c when I press the defrost. Those crafty Sweeds know a thing or two

[@gehtdianschasau8372]

I like your videos, well made, interesting and well researched. The background music is a bit distracting. I like, that you use the far superior metric system, but maybe you should have inserts that tell our imperial friends how many squirrel-loads (or whatever their small unit for volume is) 53 ml are. Have fun, and keep uploading quality content! Btw: Make shure the windows aren't full of ice, before you try to open them. If it's frozen close, you might ruin the mechanism, if you try to open it.

[@Porglit]

Use shaving cream to shave off a couple minutes from your morning commute. Cute.

[@19Bob57]

Ready for this............ Wait for it, no, no, Wait for it........... Mix 45% Alcohol with 55% Water. On that COLD Freezing Morning/Day when Your Windshield is Ice/Frost Covered. Spray the Windshield with this Spray!!! Walla, Frost/Ice GONE. (Inside) Prevent Fog upon Your Windshield by Cleaning it with "Shaving Creme". Yes, it Works... Even Use this Trick on Your Bathroom Mirror... AND Always Remember. "NEVER" turn on the Cars Rear Window Defogger on a Frozen Iced Window. Start the Car. Let the Window Warm up just a bit... Then Turn on the Rear Window Defroster!!! Or Turn it on like Many People do "And Watch the Window Blow up."

[@mdickinson]

Walla, as in Walla Walla, Washington? Or maybe you meant voila!

[@michaels.8244]

Grim Reaper syp going to have to use the shaving cream trick, my ac doesn’t work, it was raining out this am & my windshield started to fog up. I hit the windshield defogger button & it made it worse. I was even driving with the window cracked up & it was still fogging up a bit.

[@jordansteen8254]

Shave yourself a couple of bucks

[@florianbergling3086]

Gvv v v. J Jg fx Mb

[@asaiya705]

If you live where i do in Canada, you science this very early on life lmao

[@colbablast6579]

I mean the defogging doesn't really help me when the whole window is just ice lol. For my science experiment, I use a scraper haha.

[@billcosby9156]

When i was late to school i stuck my head out the window. Aint no way we bein late.

[@LitoMike]

mark really taught condensation better than anybody else can

[@GrowinLight]

Actual instructions- 4:20

[@feelinghypothermic]

truth96130 Thank you :D, but I love the science

[@christopherpayne6228]

Actual science- 00:00

[@The_Gray_Fox947]

Coincidence? I think not

[@nickx831]

@@christopherpayne6228 it's called common sense.

[@cabarooni]

blaze it

[@0merdad]

Most teachers have 0 to 500 subs.. until you notice this guy with 4 mil is a collage professor who worked at nasa

[@shaunpierce4174]

* college

[@tinysoccerball5938]

What college?

[@seikibrian8641]

Omerdad Gamer "...a collage professor..." He teaches arts and crafts? ;-)

[@seikibrian8641]

@@tinysoccerball5938 He went to BYU (Brigham Young University) for his Bachelor's, and USC (University of Southern California) for his Master's. But I don't think he's a professor anywhere; I think Omerdad Gamer is wrong on that point.

[@dollys6147]

6 mill now

[@mohammadassad6550]

Here I am sitting in my car with foggy windows having to watch a whole science experiment, please just give the combination

[@trina8350]

My dad always turns the cold air on the windshield when he gets home before shutting off his truck. That way it doesn’t fog up with the cold winter air

[@SlayerofFiction]

lol, wut

[@zombiekiller7101]

Won't it cause more condensation

[@trina8350]

@@zombiekiller7101 It doesn’t no. Once you cool off the windshield and bring the vehicle down to the level that is the outside temp, it makes the window the same temp so they don’t frost up. I’m talking winter not just dew and moisture. It is minus 20 degrees so if the window is really hot from driving for some time, when you shut the vehicle off, the window frosts inside, which is a pain to clear later.

[@SonsOfLorgar]

@@trina8350 also, when he does that, he dries out the air in the cab by replacing the volume of warm moisture laden air for a much colder and thus dryer volume of air. Will copy this method for the winter of -21/-22

[@PatEm10]

Mark Rober: That friend you don't even try to argue with because you know he'll embark on a month long science experiment just to prove he's right then make a video of the results and post to KZbin just to rub it in your face.

[@MrDoboz]

therefore: you don't want him as a friend

[@eatshitful]

I would of argued he wasted all his time doing this because a little knowledge of cars would tell you the manufactures figured this stuff out in the 1980s! You can't re circulate with defrost on because the defrost is the intake vents for it and the AC automatically comes on any time you put it on defrost! I'd love to be his friend and argue all sorts of things related to cars :)

[@JimBryson1]

One of the suckiest things about winter is living in the north, where you don't have condensation inside your car, but frost on the outside. MUCH WORSE! (and maybe frost on the inside if the slush that melted off your boots condenses and freezes on the glass overnight.)

[@Ostrogoat]

+Jim Bryson Electrically heated windshield. Extremely useful. Or just use something to cover the windows up, that helps too.

[@arghc]

+Jim Bryson Frost on the outside *and* fog on the inside as soon as you get in and start breathing 8-). The 4 steps in the video miss the problem of _when_ to crank your heater up to high 'cos if you crank it up to high right off, you blast freezing cold air through the car...

[@Magnussen92]

+Jim Bryson Just take a bucket of really hot water and pour it on the windshield! This way the windshield breaks and you can easily kick it out to get a clear view :) 10/10, works every time!

[@julienjjj]

+Jim Bryson Why don't you just scrape it off ? Every snow broom has a scraper on the handle.

[@lauraclark952]

+Jim Bryson a solution of 2/3 rubbing alcohol and 1/3 water in a spray bottle. Spray it on and the frost melts, problem solved. :)

[@soulextracter]

I don't have an AC, and it takes like half an hour for my car to start pumping out hot air when it's on idle.. :P Guess I'll l have to go with the shaving cream!

[@horstgunther9521]

Yeah it’s the same with every car without an electrical heater. in idle there is very very few gas burned so very little heat is produced and the water used for your heating will only warm up slowly. It would get warm way faster if you just started driving right away

[@soulextracter]

@@horstgunther9521 Yeah I know, the problem was that I couldn't see anything with all the fogging going on!

[@horstgunther9521]

@@soulextracter well that's bad :D

[@brrjohnson8131]

When I lived in the Colorado Rockies -45 below was common one year. First thing in the morning I put on my long johns & gloves, go outside immediately in the am, started the car & positioned a rock on the gas pedal positioned just a bit more than idle. It took a minimum of 20 min to see out, 30 minutes to clear the windows and almost warm the car. That perfectly shaped rock never left the car. Edit: I went back inside to drink coffee & get dressed.

[@8bitblockhead721]

who has a google+ haha

[@waynenocton]

Great short video. Driving in snow I see hundreds of people with dry road dirt on their windshields, I see them washing over and over until they run out of washer fluid, then pulling over to throw snow on the windshield to try to wash it again. Pro tip, TURN YOUR DEFROST OFF! You are flash drying the road dirt, if defrost is off, your wipers can wipe the dirt away BEFORE it dries. Seems like common sense but honestly, knowing this can save so many problems up to and possibly including crashes.

[@AllTerrainGuy]

I use the same exact techniques in my Jetta!! This guy deserves a smash on the like button!

[@aabidamn]

Which one?

[@JustKaylaNicole]

Got a 2013. Can't wait to make use of this new knowledge 😭

[@2lazeblue]

You mean a squish

[@saysoun752]

Yep, this is why newer cars automatically turn on the AC when defrost is selected. Most people already know this. I don't like blasting hot air during the winter time though as it can actually break the windshield. So I blast it at medium settings when it's extremely cold.

[@AG.Floats]

Blasting the windshield with hot hair will break the windshield this guy says lmao. ^

[@Jadeskorpion]

It's amazing how far his video skills have come in 4 years.

[@CubeBizz]

Thumbnail says defrost, I've been scammed

[@frankdoss6313]

@@amsn231 I really haven't had an inside fog problem since I got married.

[@NathanielSpencerNomadn8dagr8]

Just watch this last night went out this morning and I had those settings on my truck I'm glad I'm a smarty pants but I know I can learn more which is why I'm going to take your class thanks for teaching me as much as you do

[@mistaxtony]

Ahh no wonder the a/c gets turned on when I switch on the defogger/deicer

[@CaBobProductions]

Lived in Denver for 2 years, got a new car in the meantime and forgot how to defrost my windows the right way, sitting in my car now looking at my clear window 😀

[@jasmint3207]

I think it would be best to heat up the air inside for a while, then open the windows or doors for a moment to exchange the warm, moist air with cooler, dryer air from outside. Then heat up again. Better than just cracking a window. That is what we do in Germany to keep moisture low in our flats and to avoid mold. It's called "Stoßlüften" (airing out in one push). In a car it should happen pretty fast. In a flat it takes a few minutes (depending on the difference in temperature). Opening opposite windows for optimal air exchange is called "Querlüften".

[@rustyshaklferd1897]

Easier to open the passenger window and close the drivers window then open and close the driver side door a few times.

[@bradleyd6000]

Unless you live in a region of the country where you get heavy thick fog when it's 40f (or about 4c) out side then your just bringing in cold very humid air.

[@gimpygardner3377]

I owned a couple VW Beetles. In Chicago. They had minimal heat, and only when they are moving. I carried 2 ice scrapers. A short one for the inside if the windshield and a long handled scraper so I could reach out the window at a stop light and scrape the outside.

[@averylopez411]

3:36 Your welcome 🤷‍♂️

[@anushibinj]

you're*

[@AfallinAngel]

@@anushibinj oh lord not another spell check police 🚨

[@KineticTaco]

Jennifer jo “Oh lord, not another spell check policeman.” **

[@Kyle-ye4nj]

Thanks!

[@xplayer4gamestuff683]

Thank you

[@gottagowork]

I *WISH* fog was the only thing I had to worry about during winter.

[@aihnen93]

I got 2 mins into the video before I realized he was talking about defogging, not defrosting. Defrosting is what makes me late for work in the winter 🤣

[@Nintenbrony]

If you don't have kitty liter, use silica packets. You know, those tiny packets of salt-like things that come with your shoes? get a bunch of those, and put them up by the windshield. They're made to absorb liquids and odors in our shoes after we wear them. Go to any shoe store and ask if they have any to spare. Some stores will give them to you for a cheap price, but mine gives them to me for free!

[@CupolaDaze]

+Crucis Ardeos I can't tell if you are trolling or not but the proper word is Absorb.

[@vivekvardhan7860]

+Andy Cox You are surely not a science guy. Anyway, Adsorb is correct.

[@drakono82]

+Crucis Ardeos Huh, I was sure it was the other way around, but you convinced me. I remember my junior high science class teaching us about certain compounds absorbing water within their crystal matrices, and either was told or assumed it worked that way with silica gel. I never knew the water was adsorbed to the surface. (I mean, it's still a little petty and semantic to argue about, even on an engineer's youtube video. But I learned something, be it ever so trivial.)

[@Nintenbrony]

I don't know why you deleted his comment, but I think he's right too. I never heard of adsorb before, but silica doesn't take in the liquid completely; so it would be adsorb.

[@abhimuk1331]

+drakono82 +Nintenbrony Its adsorption, not absorption. Adsorption is like absorption, but only on the surface, not in bulk.

[@Jerrboyy]

Excellent towel analogy! I used to use a bucket analog but i like the towel explanation too!

[@Zyr4n0]

No use to turn the heat up, when it's freezing outside and the engine is cold, there's no Chace to get hot or even warm air for the first several minutes. Plus the engine is stolen all heat and therefore cannot get up to a proper working temperature for longer.

[@michaelvigil5321]

What did you mean with the last sentence? I am genuinely confused on what you were trying to communicate

[@MelVinegar]

After years, he's still a firm believer of the scientific method.

[@yaklin104]

I think most cars automatically turn off recirc and turn on A/C when you have the defroster on. The window bit is a nice trick. Edit, most *modern* cars

[@samuelstuff4557]

I watched this before I could drive but now that I can drive I really know the pain of a foggy window. Thanks for the answers!

[@claycon]

😂😂 he said “Jurassic park shaving cream!” I understand that reference 🤓 Actually it’s the best shaving cream. I still use it. 👍🏼 Btw- if you blow-dry your razor after every use it will last for months

[@drowningin]

I dunno about no frosted windows in Houston. But humid hot air I cycle between cold and warm. If I do cold too long it fogs up, hot removes it then fogs again. It's a battle.

[@erickingsepp]

"now you can SHAVE a few minutes off your morning commute …" Hahah ICWYDT

[@JStorysuoertech]

Bro seriously??? That was amazing!!!

[@jeandiatasmith4512]

Gosh YT must like you - putting this in my list today. And since I'm here. One thing that will help, anytime you're using the defroster - put your visors down. This pushes the air back onto the windshield, so it defogs/defrosts even faster.

[@blazemordly9746]

So barbasol can help me shave some time in doing this?

[@farfromirrational]

I hate to go "against the grain", but using barbasol actually makes your wallet "thicker" by "trimming" the cost.......of "course" unless defogging your car every morning has "grown" on you, you should "goatie" the store and "handle" it right away *mic drop*

[@ChillPillDyl]

“SHAVE time off your morning commute” an unrealized pun 😂

[@Ragatokk]

Pro tip: Get a towel... Now if you live where cold weather is actually a thing, get an ice scraper.

[@user-ty3bu6nu3c]

Ragatokk PROTIP

[@johncrafton8319]

The ice scraper works for the outside, where there's actually ice. The condensation on the inside is still an issue that won't be addressed by that ice scraper.

[@Billy123bobzzz]

We carried several towels and with a few people in the car the towels would just get soaked and completely ineffective, its not a very good tip at all. :)

[@everettlawson1231]

Thank you. I've been needing this for years.

[@cindyrose9978]

Everyone: Commenting on faster ways to defog a window Me: *looking for that comment about a miraculous reference at **4:25*

[@cburakb]

Hey @Mark Rober for the sake of scientific method, did you compare circulation on vs. off? Because yes, the outside air is dryer vs. circulating BUT when you circulate, the air will get warmer much faster vs. bringing in 10/20 degrees below freezing cold air. It sometimes takes 20+ minutes for the car the warm up in Canada so I'd love to see a comparison between only that variable. The AC coils will continue to dehumidify the circulating air anyways so if you circulate, you may end up having warmer air, ie. bigger towel that you keep on squeezing.

[@icedpacmangames4886]

Actually using the re circulated air is counter intuitive when trying to heat or cool the when you first get into a car.

[@homealone5087]

@@icedpacmangames4886 Seems pretty intuitive to me. In the winter you're heating up warm air vs trying to warm up cold air.

[@zuum2496]

I use a variation of the recirculate button in frigid weather. First, off until the temp gauge moves, this brings in dry air, then on to use hot air. I may adjust depending on what air I assume is drier.

[@EllaBee90]

I couldn't get my car to heat up during winter until I did this : Fan on at maximum, Recirculate button on, heat at max and let the inside air get warmer. Once it's done, change for the dryer outside air. Instead of taking 20 minutes, my car takes 5 min to get comfy and my windows are finally clear. After 7 years it's about time. LOL

[@unboxings5218]

Explains better then my Science teacher 😂

[@Warmsunset26]

Thanks mate. I just seriously find just putting a towel/cloth on the OUTSIDE of the windscreen holds the moisture. There fore removing the towel/cloth from overnight, you are removing the moisture and for the whole/main part of the windscreen it is clear. What is also beneficial is to run your engine for between 3 - 5 minutes before starting off. Better on the engine and also aids in extending the LIFE of the engine.

[@RolandSchlosser]

"Jurassic Park Shaving Cream" lol

[@justinmoore6162]

I have no temperature control in my car. I have cold (the furthest setting on the dial) and super-cold (pressing the button) so it defrosts the windshield pretty quickly but then it gets so cold it reverses it and it starts getting wet on the inside...

[@tomflaushe]

Interesting video. Thank you Mark. It’s 0c here currently in southern England and I have a hybrid. I do all of these tips already but due to the engine not warming up quickly enough (battery) it takes forever to clear my windscreen. Annoying part of the hybrid that draws its heat from the engine. I imagine full EV’s do not necessarily have this issue as the electric heat is almost instant (like their power). The hybrid still draws its heat from the engine. With that not turning over nor moving air through its radiators at speed due to it being unsafe to do so means the the hybrid car makers need to install a toggle between engine heat and battery heat! Cheers.

[@aspecreviews]

My first-gen Prius forces the engine to remain running when heating.

[@tonyrisberg2201]

The entire YT community must show Respect to the greatest teacher, professor Rober… making science fun, practical and interesting for millions of students…..

[@gothops154]

I'd recommend not using AC when having the blowers directed on your windows as over time it can leave an film which makes it foggy and hard to see out of especially at night.

[@sycops1]

That's called dirt... clean your windows!

[@drops2cents260]

Or maybe have your A/C cleaned and inspected, they too need some love from time to time, you know?

[@canonlygoupfromhereet5166]

Mines gets all bitched up from smoming a bunch of cigarettes. Its so neat to see how dirty the towle gets when cleaning it ever two weeks!

[@Billy123bobzzz]

Clean your car, it must be filthy if that happens. Also, if you use (or anyone has used) those interior protectants for the plastic parts of your car ten this will definitely leave a film on the interior of your windows, all those products evaporate when applied and that evaporated chemical deposits on your windows. Clean all your windows very throughly and don't blame the AC, its perfectly innocent.

[@jeffh7021]

Any time you select defrost windshield, air conditioning automatically comes on

[@xceryxdemurstra6323]

Depends on the year of the car I think

[@ericchapman9579]

yes. i came here to make the same comment and i’m happy others know this. i think the vast majority of cars on the road today behave in that manner. good comment.

[@chrisp7110]

Nah my car doesnt do that. I had to do everything manually and its a 2016 model

[@ericchapman9579]

@@chrisp7110 i’m surprised to hear that. what kind of car is it?

[@Pulsarstunes]

My 2006 Suzuki doesn't do that sadly. i just have an on/off button for ac, a rotating mechanical knob for heat, and a 5-step knob for fan speed. Old school i suppose...

[@aidendoyle7252]

The real issue is if your late and the window is fogged up then you still have to wait until the engine heats up to be effective as mentioned in your first step. It would be of great advantage if you could tell us how to get the same results without waiting for the engine to heat up.

[@aomething]

So much awesome in this video. Short but sweet, great information, explaining how to approach a problem with science and thoughtfulness, dad joke ("shave" some time.... classic!), even tossed in a dig for some mythbusting. As always Mark, fine video. Thanks!

[@eds6889]

I’ve never seen a vehicle that will allow you to use the recirculated air setting while on the defrost setting.

[@cyn_na_mini]

He didn't put it on the defrost setting

[@eds6889]

He said it, he didn’t do it. Listen again to the intro.

[@sengalang]

Try older cars. Very possible. Everything is manually switched instead of digital

[@slowlanehighway6215]

My car that was almost 20 years old let me do whatever tf i wanted

[@dzlf2504]

If you put it on floor and defrost you can use recirculated air

[@brendboer6026]

Just wanted to say that the shaving cream only works for a short period of time, the antifog liquid is made for long term use.

[@martiantexan7632]

Easy enough to remember, turn everything on. The heat, the AC, roll down the windows, turn on the headlights, turn signals, the radio, the works.

[@martiantexan7632]

Yeah, making fun of 3:35, haha, knowing the duct controls don't allow it.

[@pirateramblinrose]

@Tomato Sauce yes you can, at least every car I have owned does 🤔

[@Razorgirl]

Awesome! Always noticed hot worked better, and now I know the SCIENCE!!! behind why. 🥰 Please do a video on what is the best way to deal with ice on the outside of a car window. 💙🙃