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I just got a pair of Motegi 18 inches rims with a silver lip. But for some reason they keep getting what it seems like the black polish from the rim onto the silver lip. Anyone know of a good cleaner for the rims? And what the hell is that black polish that keeps coming of the rim and where is it coming from?

 
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You sure that the residue isnt from your brake pads.!?

 
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I'm gonna say this is the problem

 
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Probably brake dust, go get you some ceramic brake pads that sure clear it up good.

 
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I had black getting onto my rims too didn't think much of it at first because it had been raining alot. After the weather cleared up it was still reappearing I found that my brake boot was leaking fluid. I had the brake boot replaced the part was only about $20 I can't really remember exactly but it wasn't expensive.