Bar Keeper's Friend. Available at any grocery store for about $ 2.25 is the best choice. Do not get dry powder on the glass. Make a paste with BKF and distilled water. Use cloth rag to apply like you would use a rubbing compound. Let dry and buff of. Saw this on the Hot Rod TV show about 10 years ago. I have used it ever since. I always test a spot first and then use a flashlight to look for scratches. I have read that some glass is softer, but I have never scratch one yet.
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