I have a class A with a fiberglass roof. I park it along a tree line in the summer & inside in the winter The roof is black on about 25% of it. I got up there today with a bucket of oxyclean mixed ...
I've had class A coach's 12+ years & it has never been this bad. I've used Tile X, & a brush.......that used to work. I'll try bleach......I've mixed that 50/50 with water to clean the house roof. Thanks for the response.