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I bought some of this to use on my box van. It's white, huge, and was covered in rust speckles. I was planning on five or six hours of using a clay bar on it, but bought a bottle of Iron X and gave it a shot. The stuff is expensive, but it works. It took two applications, so about 20 minutes in total start to finish. The van looked new again after.
I also used it on the wheels on my Triumph, which looked like they'd never been cleaned. They cleaned up great.