My 2001 van looked that bad. Its never had its wheels cleaned by scrubbing ever. It was caked on good. I tried both this and sonax and this just did such a great job. Using a round detailing brush and very little effort, mine came out looking great. Never spent more than 2 minutes per wheel brushing over them. Im still shocked at how well they turned out. Frankly, the wheels are the best looking part of the van lol considering it hasnt been waxed in many years. Im a believer in this mequires stuff though, im going to keep that stuff around.

did you try brown royal wheel cleaner ?