Roof Cleaning: 'Wet and Forget' versus Hydrogen Peroxide (1 of 2)

In this video I set up a comparison of two different roof cleaning chemicals: hydrogen peroxide and "Wet and Forget" (outdoor concentrate). This is Part 1 of 2.
Many pros in my industry would dismiss the idea of using either of these "weak" chemicals to clean organic growth from an asphalt roof, opting instead for the traditional (and far stronger) chlorine bleach or the (damaging) pressure washer. But as I explain in this video, there are reasons consider these weaker chemicals in a passive application.
Let's see how these chemicals do on my shed roof.
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[@chrismedvetz6202]

Thanks doing my roof this weekend going to us HP.

[@JohnDoe-id9hi]

Thank you for sharing your research! Definitely worth subscribing and a 👍

[@sjpropertyservices3987]

Thank you for providing this two part video. I particularly appreciate the follow up over several months to see the results of the cleaning. I was leaning towards using a hydrogen peroxide solution to clean my roof and your video gives me the confidence to do so this spring. Please let me know the following: (1) I read in a reply to a comment that you used 3% hydrogen peroxide. I have a gallon of commercial grade 12% hydrogen peroxide I use for various cleaning jobs. Interested in your thoughts on using this 12% solution vs. the 3% solution you used ; (2) what was the ratio of hydrogen peroxide to water; and (3) if you used a detergent as a surfactant to help the cleaning solution adhere to the roof. Thank you!

[@seattleprowash5464]

3% hydrogen peroxide means 3% peroxide, 97% water. In other words if you have had 12% peroxide, you'd need to add 4x the volume of water to reach 3% peroxide.

[@alxjhn]

How much peroxide per gallon of water

[@dianechristine1388]

Thank your sharing!! Is the Peroxide full strength? Is it washed off at all after it's applied or just allowed to sit from Dec to March?

[@seattleprowash5464]

What percentage mix did you use for peroxide??

[@par2031]

Hello! Please tell us the strength of the HP you used and if it was cut with water. Thanks!

[@daveanderson6865]

Where do you get enough hydrogen peroxide to clean a whole roof? I would have to fill my shopping cart of those pint size bottles. Also, I'd you use any soap?

[@OutsideCleaners]

No soap. Most box stores or chemical suppliers sell in bulk.

[@gracehomeservicesllc2476]

What's the ratio for hydrogen peroxide on the roof ?

[@OutsideCleaners]

Hi, I used straight peroxide from the pharmacy. 3% concentration.

[@everzamora9031]

@@OutsideCleaners how many gallons per 1000 sqft? And do you use a surfactant in the Hydrogen peroxide?

[@johnedwards4715]

Run off wouldn't stain your siding if you knew what you were doing.

[@DennisSchmidt-k2z]

Hydrogen Peroxide is H2' O2 it brakes down into H2'O and O'2 (Water and Oxygen) .... Yes I am a nerd.

[@johnedwards4715]

ARMA recommends bleach! Not Wet & Forget!

[@ronbowers9452]

How strong is the hydrogen peroxide? Is it the same as the brown bottle stuff one can buy everywhere?

[@seattleprowash5464]

@@ronbowers9452 3% straight application

[@victoryfirst2878]

Do you add liquid soap to the peroxide solution before spraying OC ??

[@OutsideCleaners]

Definitely not.

[@seattleprowash5464]

Chlorine is also eco friendly, it breaks down into salt once it dries

[@davidszakacs6888]

I tried Wet and Forget roof cleaner on the black roof stains but it did nothing. Used a professional instead.

[@OutsideCleaners]

Sometimes it’s the right tool for the job, sometimes it isn’t.

[@mickaparrish]

Advice please in your opinion what's best roof cleaning biocide ?

[@OutsideCleaners]

There is no “Best”. There is only best for a particular situation.

[@OutsideCleaners]

The type of roofing (cedar, composite, metal, slate…), the customer’s time requirement, type of organic growth (algae, moss, lichen..), gutters or not, the type of siding near the roofing being cleaned, temperature at application, compass direction of the roof versus prevailing local weather, sunny or cloudy, etc etc. these things matter.