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      08-17-2011, 01:27 PM   #20
blschaefer1
Former '07 M Coupe Owner
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Drives: 2019 440i GC, mSport.
Join Date: Jun 2011
Location: San Diego Area

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Spray it on after you clean the wheel, and it creates a coating which 'repels' the brake dust. You reapply it after each washing, but it keep the wheels much cleaner in between the washings.