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My favorite for exhaust tips is P21S polishing soap. 0000 steel wool or a brass brush if you really need it. Bought my car CPO and it took a handful of scrubbing sessions (made a little progress each time I washed the car) to get through the layer of buildup on the right exhaust tip, but now it's really easy to maintain. I also recommend Wolfgang metal sealant once you get it clean.
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2016 340i M Sport | 6MT
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