Normal for a worn EDPM rubber roof. Eventually the white part of the coating wears off as it oxidizes and the black, base rubber starts to show through. Don't clean it or recoat it with any petroleum based products. 303 mentioned above is water based so is ok. Worse come to worse, Dicor makes a products for putting a new white coating on the roof. Not too expensive or difficult to apply. Then the roof is good as new as long as the base rubber hasn't failed.
Some people recommend diluted Simple Green for cleaning.
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Tom and Pris M. along with Buddy the 17 year old Siamese cat
1998 Safari Serengeti 3706, 300HP Cat 3126 Allison 3060, 900 watts of Solar.
Dragging four telescopes around the US in search of dark skies.
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