here ya go. it's tedious, but worked eventually.

I let my rims go dirty for a long time, so the cleaner had to soak a little bit. Just make sure the spray doesn't dry on the rim.

The spray foams on contact and clings to the rim pretty well. I just kept re-applying it and after about 10 minutes started scrubbing with a stiff bristle brush, then used the buffing ball on my drill.