From what i have read in the past these roofs shouldnt be cleaned. Basically the rubber roofing is somewhat layered, and when the initial layer wears, the secoundary layer of rubber kicks in, and so on, and so on. This is why new trailers have gutter systems, so the roofing oxidation does not stain/drain on the trailer. There are products out there by roofing companies to restore rubber roofs, but not to clean.
just my .02 d-mo
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2008 Nissan Frontier 4x4
2011 Rockwood A122
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