They are either anodized or coated with clear lacquer originally. A frind of mine had polished alloy wheels on BMW and he were cleaning them every week and polishing every 2 weeks to keep them in good condition. Also using some kind of wax to protect from corrosion and not using in winter.
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Currently 8less
2011 Q7 S Line 3.0TDI, 2016 Tesla Model S 90D
8 history:
2006 A8 Sport 4.2TDI quattro SOLD,
1997 S8, reached end of life with gearbox failure
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