I used to use simple dish soap and a separate bucket with separate woollies and sponges just for the rims and tires. Later I read in Consumer Reports that Eagle One A2Z was rated best in their tests, so I gave it a try. It does work pretty well and you don't need to scrub as much, so that's what I've been sticking with lately. I get the larger container, but I don't use the build in spray nozzle; it's total crap. Instead, I purchased my own spray bottles and pour the solution into those with a label instead. That works a lot better. So my vote is Eagle One A2Z.
I have also tried using my steam cleaner, but that doesn't work very well either. Brake dust likes to cling tenaciously to the rims and it does seem to take a bit of elbow grease to get it off. It's easy to find if you take a swipe with a cloth or your finger, and get a lot of black on it even though it's not easy to see it on the rims themselves, unless it's been a long time since they were last cleaned.
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