My camper[Rockwood 1910] has been uncovered for a year. I have tried to keep it clean, but the textured roof leaves thousands of tiny places for black stuff to accumulate. I have scrubbed and scrubbed with a good RV soap and semi soft brushes, and still have some black crap that is a PITA to remove.
The question is What is the best way to clean a dirty roof. I take it that bleach is a no no.
Yep, I should have covered the roof but I didn't.