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If it counts for anything Sonax is a German brand and very highly rated over there an trusted by many car detailers. Im sure they thoroughly test on bimmers, mercs etc. I wouldn't be surprised if they make the BMW OEM car care range.
For baked on brake dust and tar unfortunately soap and water doesn't cut it. Do wheels with wheel cleaner every second wash and just give the wheels a rub down with regular car wash in the interim if you're concerned about product harshness.
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