I clean mine twice a year with laundry detergent or a household cleaner like Spic & Span, or Simple Green. I tried a treatment once, I think was ProtectAll's roof treatment, and it made no difference to how the roof stayed clean/resisted chalking. If you go to Dicor's website, it has a lot of information on rubber - both EPDM and TPO roofing. I don't get too worried about the appearance of the roof - you can't see it from the ground.
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WillyM
2015 MS 38RSSA. 09 Ram Dually Diesel, 68RFE, 4.10.
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