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      01-12-2013, 09:59 AM   #17
Field Marshall

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Drives: 2011 M3 ZCP + 2014 535d xDrive
Join Date: Jun 2007
Location: Utah

Posts: 187
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Sonax FE Wheel Cleaner is a tremendous product. I typically spray the wheel and agitate with the big blue brush which helps to get the inside barrel of the wheel clean. I also leave the Sonax on for about 10 minutes, provided the car is in the shade and the wheel is cold. I use P21S every other wash as Sonax is expensive, even though I buy the 5 liter container. It also helps to dry the wheel completely after rinsing.