Teresa, as I have said several times in earlier posts, I use the same product as Montana Sky has mentioned above, but I get up on the roof only three or four times a year. We have never had a single black streak (which primarily comes from the product of roof oxidation being washed down the sides). We have had our Montana for just over five years and have traveled over 50,000 miles.
But, I must confess, we are not full-timers and therefore are able to keep our RV parked under cover when here at home, and have the opportunity to clean it conveniently. I cannot compare our experience directly to those who are on the road constantly, or almost so.
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