Ivory or Dawn dish soap is good at removing basic dirt, but not stains and black dots. I've had good luck with Protect-All Rubber Roof Cleaner or the Camco equivalent and a soft bristled brush. An application of Aerospace 303 after you clean the roof makes the next cleaning a lot easier plus it has UV protectant. Many don't like to get up on the roof, but "it ain't no thang " to me.
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