I used the Sylvania Headlight Restoration kit via Amazon. Worked great. Included everything including sandpaper(s), polish, and magic potion. Plus, it's guaranteed. Find it here:
https://www.amazon.com/gp/product/B0...?ie=UTF8&psc=1
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1972 Bavaria> 1973 3.0Si> 2013 328i> 2009 E92 M3> 2013 F10 M5: Singapore Gray over Sakhir Orange, Executive, Driving Assistance, B&O