Took both of my W211s through a car wash...garden variety brushless wash. As always happens, the automated wash does not clean off all the the brake dust...I just deal with that after the fact with a hose and microfiber cloth. This time, however, it looks as though the brake dust has somehow stained the rims. There are spots that just won't come off. So I'm assuming they are "trapped" under a layer of wax and/or clearcoat.

What's my best bet for getting the wheels clean? Thus far I've only tried a hose and a cloth.

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14 E250 Bluetec 4Matic "Sinclair", Palladium Silver on Black, 157k miles
06 E320 CDI "Rutherford", Black on Tan, 175k mi, Stage 1 tune, tuned TCU
91 300D "Otis", Smoke Silver on Tan, 144k mi, wastegate conversion, ALDA delete

19 Honda CR-V EX 70k mi
Fourteen other MB's owned and sold
1961 Very Tolerant Wife