Why do you want to treat/maintain/clean the roof? The only requirement is to inspect your roof 3-4 times a year (assuming rubber roof. Motorhome might have a different style of roofing). That inspection is mainly to ensure that the caulked seams at the sidewalls are still intact and that there aren't any holes in the roof. There is no need to "treat" the roof with anything.
Cleaning your roof is a personal preference. I don't look at my roof (except when I inspect it), so I could really not care less if its clean or dirty. Rain will clean off the majority of the dirt. Unless you clean your roof and camper every single week, you are going to get black streaks regardless.
I've been camping in trailers since I was about 5. Never once cleaned or treated the roof on any camper we've ever had. No negative effects. In fact, up until about 10 years ago, there weren't really any "treatment" products available for rubber roofing. Enough people started to search out a product to apply... so companies started to make a product to sell. I haven't seen any evidence that a treated roof lasts longer or inhibits water better than a non-treated roof. I truly believe that all these products are simply an opportunity for chemical companies to make money, rather than an opportunity to improve the quality or lifespan of your roof.
Once you find the type of roof you have, contact the manufacturer and ask what they recommend. I had an EPDM on my old trailer, there was no recommendation to do anything except for occasionally clean with a mild cleanser. My current trailer is Alpha-Ply TPO. Same thing... occasionally clean with mild cleanser. No UV treatment, no sealer, nothing else recommended by the manufacturer...
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