[ERA Chas]

cobra,
For a quick week to week job when they're just 'cloudy', I use Mothers aluminum polish-it's relatively cheap and gives OK results. I use Flitz (crazy expensive) for a really bright 'hard' shine. Wenol is excellent too. Apply with old cotton face towels which have good scrubbing 'tooth' to them. Remove with toilet paper -the cheapest industrial kind. Easy to use and gets every bit of black muck off, then throw away.
If they're really going gray, I start with 0000 steel wool, (will not score the metal) Mothers, THEN face towel, Flitz and tp. I love the wheels but hate the valve stems-wish they were in the Trigo location.
You mention Powerball-how do you clean it for reuse? Do you buy a lot of them and dispose? Is it effective on the fronts where there's not much offset?
Never heard of Maas-I will look at their web site. What's your experience with that?
Forgot to mention, I prefer doing this when the wheels are up and you can rotate the tire. I can quick-jack the fronts one at a time but the rears are a PIA unless I have it on jackstands for work.
I think we're nuts...