Yes to the WD-40. I use them on my exhaust tips keeps them looking good as new. 
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1976 Chevy K10 CheyenneTrue Duals with glasspacks and cutouts, Blacked out tails, Rockford Fosgate H/U with 2 Sony Xplode 6x9s and 2 8" MTX Subs with a Alpine Amp. New front clip in primer. For Sale $2000 obo
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