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I've got the same problem, FWIW. The finish is oxidizing -- you'll need something that specifically fights oxidation, followed by one or two different polishes to restore the gloss.
I was tempted to mask everything off and just lightly sand and spray it gloss black, but never got around to it.
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Now: 2017 Corvette Grand Sport, 2021 AMG C63 S sedan
Past: 2011.5 M3 sedan ZCP
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