Boeing Facts - Black lines on the wings

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On the wings of the Boeing 737NG's there are some curious black lines painted. They form boxes with some irregular shapes towards the back of the wings.
What are the purpose of those lines and can you really de-ice a Boeing 737 wing using Flower-spray cans?
These are some of the questions I will be coveing and explaining in todays video.
There are more videos coming up soon in my series about the Boeing 737 and its fantastic design so stay tuned!
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A huge thank you to the following channels that I have borrowed some clips from:
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