Alright im trying to sell my BBS rims, but one of the rims is really bad with carbon build up. Its so bad that you have to chip it away with a flat head screw driver or a knife. the problem with that is i scrap the rim. ANYONE know the best spray or liquide to break that crap down, becuase at this rate i wont be able to get any of it off.

 

steam cleaning useing dish washer.. option 2 get a some carb cleaner it won't hurt ur wheels but will hurt the rubber...

 

Simple green is a good degreaser but if you try any chemical use it on a spot you cant see to test if first.
My .02