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I have been doing my roof at least once, sometimes twice a year for the last 10 years. However, I do it when the enter unit is in need of a complete washing.
Using my handy dandy 5 gallon bucket, I first pour in enough bleach to barely cover the bottom and add about 3 gallons of water. Then, dump in a generous amount of blue Dawn. Use the soft brush and go to work.
I rinse the loose stuff off first from the entire roof. As I brush, I do it a section (4 X 8 foot) and rinse very thoroughly. When I have the entire roof washed down, I usually rinse one more time.
Then, I start on the sides using fresh water with automotive wash/wax and clean soft brush and get to work.
BTW. I use the same bleach and blue Dawn on the awning fabric, too.
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