JSork25

This was recommended to use on rims as a degreaser.... spray it on after rinsing down the car (and rims) with water.... let it sit while you wash the car.... by the time you get to your rims the brake dust will have nearly all washed off and what's left is an easy once-over with the sponge/mitt.

http://www.spraynine.com/

I have yet to find this in a store to give it a shot - has anyone ever tried it?

TSC17

It's great for stripping wax and prepping the surface for polishing...especially when there is "mystery product" on the surface. Spray Nine has been around for a long time.

I've never used it on wheels though.

Oh, and you should wash your wheels first, not last. They're the dirtiest part of the car, and you risk getting abrasive and corrosive wheel "gunk" on your freshly cleaned paint if you do them last.