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 BMW 325xiT - TiAg/Grey Leather
2007 BMW X3 3.0si - AW/Chestnut Leather
SOLD - 2008 e90 M3 6MT AW/FR - Dinan S1