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Two words for y'all - Purple Power. Cheap, super effective, readily available in the big ol' jug. Used it twice weekly on my E46 330xi for 4 years/80K miles and now on my 128 (on the stock wheels and now the Breyton GTS-R's), full strength with never a problem. Wheels on the 330 looked brand new when I sold that car - clear coat still perfect. If wheels are slightly warm, spray on/hose off removes literally 90% of brake dust. Wheel cleaners are an expensive joke, totally unneccesary.
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