My friend has a few scratches in his windshield and was asking me what to use. I looked around online and found a lot about Cerium Oxide. It is used to polish glass, mirrors (telescopes) and stones.
He said he wanted to try it but I don't think he ordered it yet. If he does buy it I will post up with the results.
Found it on Amazon, everything from an 8oz bottle to a 525lb drum
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