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The color change is such a satisfying way to tell it's actually working, and I barely had to scrub the brake dust off my front rims. It's thick enough to stay put on vertical spokes, which is exactly what I needed.

The gel actually clings to the wheel instead of dripping off, so the purple-to-clear color change lets me see exactly where it's working. Brake dust came off with just a rinse and light wipe, no scrubbing session needed.

Threw away my old scrub brush after one use of this. The gel actually clings to the wheel instead of dripping off, and watching it shift color as it breaks down the brake dust is oddly satisfying. Rinsed clean with zero effort.