Bigpikle- Glad things worked out so well for you! The steamer oughta be a good addition to your ONR regimen
Yeah, my steamer was the only way I could get the never-cleaned calipers on my '84 RX-7 clean without trashing the factory cad plating. Heh heh, the back side of your wheels wasn't all *that* bad in the "before" pics, it'll go slower on wheels that're in really nasty condition
Yeah#2, the AG Bumper Care is nice for jobs like that, does a little bit of extra cleaning too. It's a good product that doesn't get much attention here.
One caveat for people trying this sort of thing with the steamer: if the vehicle has factory undercoating/sound deadening, especially the wax-based stuff common on European cars (the stuff that's often incorrectly called "cosmoline"), be a little careful. It's not too hard to melt/soften/compromise such coatings if you get a little too aggressive with the steamer. If you heat the stuff up to the point where it gets "milky" looking you've gone too far.