Ok, I just cleaned (or tried to clean) all 4 wheels on my X5 and cleaned one of my Boxster S's wheels. Guess what? The Boxster S's wheel looks EXACTLY like when I first took delivery. Ok, maybe it looks even better.... The X5's wheels look like crap.

The Boxster's wheels don't get 25% as dirty as the X5's. I am almost thinking that the Boxster's brakes are ceramic. The X5's almost turn black (no joking). Cleaning the wheels on the Boxster has been a snap. Granted, I Klasse-sealed the hell out of them when they were new and use P21S to clean them, they look EXACTLY as good as new on the face AND inner section of the wheel (yes, I clean the inner sections also).

I Klasse-sealed AND added another layer of conventional wax on top of the X5 and looks like the brake dust is STILL embedded into the wheels - even the front surface. Using a claybar nets a destroyed clay bar when done. And I still have a lot left to clean on one wheel. I'm on a rate of one claybar per wheel and some seriously sore hands and elbows. I am so tempted to just use a green "Scotch Brite", but I know that these will effectively scratch the wheels...

Thoughts? So WTH? Anyone have any thoughts on how to thoroughly clean these damn wheels? I am neurotic and also need to clean the inside sections.

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2004 Porsche 911 C4S X51, Seal Grey / Black
2006 Porsche Boxster S, Guards Red / Sand Beige
2008 BMW X5 4.8i, Black Sapphire / Saddle Brown
2001 Audi A4 1.8tq, Laser Red / Black, APR Stage 2, H&R Coilovers
2002 Suzuki GSX600 Katana, Yellow