Step two
After cleaning with acetone or some of the other harsh chemicals mentioned, you may end up with spots that are "super clean" compared to the sun aged general surface. A milder mix to blend it all may help get rid of the polka-dot effect, but thorough cleaning and then waxing or re-sealing the surface really needs to be the follow up. Even if you don't see polka-dots right away, the spots that have been cleaned and left unsealed will collect dirt more readily and you'll possibly get a reverse polka-dot effect over time.
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