I use my pressure washer carefully to remove most of the dimpled dirt. CC used to recommend application of Formula 303 several times per year to the smooth areas to reduce oxidation.
Red Max Pro is used on non-clear coated Fiberglass successfully. That might work on any smooth non-painted roof top. There is a thread on RV.Net currently that details the application process and the maintenance process.
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Dean
1995 38' CC Magna #5280 **** Sold after 21 years of enjoyment.
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