I had a similar problem on my white roof, including som dark grey/black spotting that looked like it had been het with hail but no dents. Tried scrubbing off with several different cleaners and had no luck. Had a brainwave and tried some Fast Orange hand cleaner on a shop towel. It worked!! Was a big job and took a couple of days, but marks came off, shine returned and life is good!! Gave the white roof a coat of Simonize wax and it looks great. While I was up on the roof, I resealed anything that looked suspect of becoming a leak, cleaned the skylight and MaxxAir covers, and blew out the A/C cooling fins.
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ACI #7394
2012 GMC 2500 HD Duramax Denali
2010 Classic Limited 30' ,1994 Excella 34'
1987 Limited 34', 1976 31' Sovereign, 1976 Argosy 22' Gone to new homes
Hensley Hitch
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