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I would would try to polish a small area (maybe top corner) by hand (mf towel) using a weak liquid polish like a plastic polish (mothers/meguiar's) or final polish type product. If no improvement at all, I wouldn't go further. Leave it as-is or replace.
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/// 2004 Silvergrey M3 · Coupe · 6MT · Slicktop · zero options
/// 2011 Jerez/Bamboo E90 M3 · DCT · Slicktop · IG: @na.s54
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