I've found that No More Dust, available at Advance Discount Auto Parts and probably other chains as well,
is by far the best thing I've ever seen for removing brake dust, but the stuff is vile beyond imagination
and really DEMANDS that you wear long length rubber gloves when dealing with the stuff, and you sure
want to avoid the spray mist! Keep a hose handy to rinse any extra off of anything that's not the rim.
It'll certainly remove grease, too. And probably any touch-up paint.
If your rims are original, odds are they're pretty worn by now. The original finish is probably pretty well abused.
I suggest you do like I did: Next time you get tires, or whenever you want to do the extra work, take
your rims to the local friendly neighborhood powdercoating shop and have them media blasted clean then
powdercoated in whatever you like.
I chose silver that approximates the original finish pretty well.
Results:
This is rim no. 5, my primary spare. (Yes, I have two spares, a steel full size and this,
once a tire gets mounted on it. I'm detail polishing this rim right now, making it even
more perfect than you see here.
A well polished powdercoated rim, especially if well waxed, is a VERY easy rim to keep clean.
CJ