Ah brake dust....the bane of every MBZ owner. My '88 300TE wheels are trashed...I drive VERY hard, and even with 2-3x/wk cleaning those wheels they still got toasted with the by-products of braking. MBZ wheels all pull air from the inside of the wheel, thereby pulling the hot air out away from the brakes and venting it to the outside. The dust, much of which is extremely hot, immediately goes to work on your wheels. I was not particularly picky when I cleaned those wheels (which IMO are nothing but a pain in the a...) and the buildup occurred. My solution: use those rims for winter tires and don't even bother cleaning the holes. Or sell them. Or melt them down (sorry, but those rims really bugged me...simply WAY too time-consuming to keep clean). Otherwise, if these are not viable options, Rennsport will refinish the rims for $75 per, and then at least you'd have the opportunity to prevent future harm by keeping them clean and coated with a nice layer of wax. And to boot, Rennsport trues the wheels up exceptionally well...just got 2 rims back and, when the tires were mounted, both balanced out with NO weights!

Sorry I can't provide better alternatives...good luck!

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Best regards, Michael
'92 500E
'88 300TE