Here is just one thread of many, on the topic; everyone has there own
method(s)/products. I like a spritz of a decent wheel cleaner, (not
left on long), a gentle scrub with a wool mitt or micro fiber towel
soaked with car wash detergent, and clay, if necessary. Avoid the
harsh brushes/hard scrubbing imo. "Wax" the clean wheels with your
fave, and try to get your wheels clean every few weeks.
Search Tab is your friend; I found the link in 10 seconds.
GL,mD
http://www.xoutpost.com/bmw-sav-foru...-cleaning.html