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You could always try acetone, my friend used it and LOTS of elbow grease on some old porshe rims. The original clearcoat was yellowing, and he wanted a fresh coat. I took him about 2 hours per wheel (this was just the lip, the centers are powdercoated black), but it worked. After that, he got some Glisten PC from por15.com, this suff is made for on-metal clearcoating, compared to clearcoating a painted surface. This stuff is aweseome. Also, maybe a quick sandblast with a really fine silca sand, so as to not pit the soft aluminum. Just some Ideas.
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=EuroLook71=
71' Super Beetle
1.6L DP - Kadrons, stock heads P&P by me 
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