Just did this today with cerium oxide from ebay. I purchased a 4 ounce container but only used about half an ounce. I did a 4:1 water to cerium oxide mix and it turned out well. When doing this, you just have to be careful to keep the glass lubricated or else you risk additional scratches to polish out.
Another warning is that cerium oxide polishing will strip your glass of any coatings; you will need to apply/reapply a water repellent in order to restore the glass's liquid resistance. I used aquapel.
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Originally Posted by utfenix335i
I'm wondering if this will work on the headlamps.
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It will work on headlamps; however, as mentioned above, the cerium oxide strips away protective coatings that may be on the headlights.