My wheels aren't powder coated, but just painted I believe. I use some cheap Turtle Wax T311 Wheel Cleaner. It is foamy and dissolves brake dust very well. Still had to scrub with a plastic brush though. I just bought a 06 uly and I swear to god the rear wheel has never been cleaned in 20k miles. This stuff made it pretty easy to clean.
Mine was not $24. It was less than $10. Idk what Amazon is doing.