Those are most likely small tar spots or caked on brake dust; you can try a tar remover like Stoner's Tarminator to remove them. Tar deposits tend to find their way into small crevices and regular wheel cleaners or car wash solution will not move them.
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-320whp / 259wftlbs-
SP Rays -- RE-11s -- SpecialtyZ Tune -- Swift Springs -- Stillen 25R Oil Cooler -- Stillen G3 Intakes -- Berk HFCs -- F.I. 12" CBE -- Stillen Sway Bars -- Es14 Spring -- INGS+1 lip -- CF Spoiler -- GTR Start Button -- VLED Parking Lights -- PWJDM V2 shift knob
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