Whether or not the Limited wheels are powdercoated or just painted I can't say for sure, but I know Meguiar's Wheel Brightener is perfectly safe on them - I have personally used it half a dozen times with nothing but awesome results.

But the SRT6 wheels are a totally different animal. They look to me, from the quick inspection I've done, to be clear coated aluminum - the fact that jonnyangel04 has peeling on his tells me I'm right. Thus, I would recommend that SRT6 owners NOT use Wheel Brightener to clean their wheels.

A very safe product available over the counter at may auto parts stores and X-Marts would be Hot Rims All Wheel Cleaner, which is safe for all factory equipped wheels. You may need some agitation with a soft brush if you've allowed the brake dust to remain on the surface all winter (inside surface of the wheel, most likely).

Those of you with aftermarket wheels, especially polished aluminum, would be best served with Meguiar's Hot Rims Aluminium Wheel Cleaner. This should be available at the same places as noted above.

Regardless of which wheels/cleaner you're working on, always work on one wheel at a time. Never spray all 4 wheels and then go back and start brushing the first one. The wheel cleaner will sit around on the 4th wheel long enough to dry, and that's just not a good idea.