The best product I've used to clean the roof is Simple Green concentrate. Mix as per label in a gallon pump sprayer, soak roof with solution, let set for a few minutes, using a medium bristle brush in a bucket of 50/50 mix of Turtle Wax Car Wash & McGuires Gold Car wash soap scrub throughly, & rinse. Been doing this for the last 10+ years.
I use the same method & products on the awning, but roll it up while it's soaking, unroll, scrub & rinse.
In 40+ years of rving have NEVER used any type of treatment on the roof, only cleaning, periodic inspections & resealing as needed, never parked indoors or under cover, never had a roof issue.
If I recall the roof manufacturer recommends only cleaning with a mild soap, no treatment mentioned.
WOULD NEVER USE BLEACH ON THE ROOF!!! Nor any product containing bleach.
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Fulltimed 10+ years
Sold '13 Thor Redwood 36 FB
Traded '13 GMC Denali DRW D/A
Replacement undetermined
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