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I blasted them with crushed walnuts, the metal is a mix type (not pure aluminum or magnesium) sort of like a "pot" metal mix, soft....I made sure they were completely clean front & back (the backs I restored myself)
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76'S 1st Porsche white/can/can early rebuild (boo) 
'84 Carrera cpe. all blk & stock 340k never a let down (might have been the best1) 
'87 Carrera cpe white/blue short flirt 
'89 Anniv. sil/linen very pretty miss her 
'88 928S4 5spd. blu/blu cmplt.SS exh.chipped lowered 
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