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I did that on my old jeep, and well, it got off the crud, but stained them, just like your gf's car. Yes, i would only try car wheel cleaners, NO mineral spirits, etc.  NOT AT ALL WORTH it to get off brake dust, and chance ruining a 2000.00 set of wheels...   At any rate, good luck. 
============================================== Supritdeol:California, born and raised Waco300ZX:Obviously... That explains EVERYTHING...   Dogpile:  only i have no hose, so its more fun   
 ^^My new Baby^^  | 
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