All ActivityMost RecentMost LikesSolutionsRe: Roof MaintenanceTry 30 Second cleaner, available at most building stores and Walmart. The stuff is amazing. It cleaned all the black mold spots off my roof (it was really bad) in literally minutes. Mix with water and use a soft scrub brush, then rinse. Does not damage the roof or leave streaks on side of trailer. I tried all kinds of cleaners and nothing else worked as well.