Barkeeper's Friend takes that shit right off, no scratches. The tips on my MPE were filthy and sooty and the BF on a no-scratch scrubby sponge and hot water works greats.
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2014 F30 N55 6MT, gray/red, M-sport, VMR 710/Mich PS 4S, MPPK, MPE
2001 E53 M54 5MT peeling green/black, well-optioned
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