Try Camco 41453 Pro-Tec Pro-Strength Rubber Roof Care System $45.94 at Amazon.
Pressure wash the roof first. Then use a Cycle brush on your buffer to scrub the oxidation off with the cleaner. Pressure wash again to remove slurry. Let dry then apply the sealant. This should give you years of service. Apply a second coat the next day for good measure.
I believe it is what they call EDPM and not rubber. I know not to use anything with silicone. I saw a number of threads where folks have used various cleaners but was curious if McKee's made anything for RV roofs since I like their wash and wax products. Camping World has a number of products not sure if they are any good. Thanks much.
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