I have the same thing in a few spots but they are so small that I'm really not concerned with them, I expect that I'll see more of them as the trailer ages. I was told that the best thing to use for cleaning the trailer outside, and especially the rubber roof is Borax powder (20 Mule Team) in lukewarm water, I might try some of this on those spots.
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2005 Springdale 249BH FW
2008 Toyota Tundra Crewmax 5.7L
Tow package
Timbrens
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