I used it on a car that's been on the road for 20 years. It was washed several times but the color was still rough. Used this on the paint and wheels and although the color change indicated it had done a good job the paint still felt gritty afterwards. But the change with the wheels was incredible! I think a lot of junk just crept into the paint, not just iron based, so I think my expectations were too high. But the work he did with the bikes was impressive. I used a whole bottle for the whole car. I would buy more to keep for the wheels. I love Griot products.
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