It's been over month since my first post. I have now been using it on my M3. For me, it definitely makes a difference. In fact, I can now clean my wheels off pretty much with compressed air...until it gets wet. Then, the pressure washer gets them clean with no other product or scrubbing. Still looking for something better though. May have to try one of these other products mentioned in the thread.
2013 e92 M3 6MT IB/BB - ZPP - ZCP - Dinan S1
2001 e46 325xiT 5MT - ZPP -ZSP - TiAg/Grey Leather
2003 e46 M3 SMG - LSB/BLK - Dedicated Track Car
SOLD - 2008 e90 M3 6MT AW/FR - Dinan S1