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You weren't specific, so http://www.gtglass.com/site/scratch_removal.html for household glass (windows) and Amazon.com for eyeglasses.
You can leave an optional "tip" with Mahalo's virtual currency, Mahalo Dollars. If you are asking a difficult question that might require some research, or if you'd like a wide variety of feedback, a higher tip often leads to more answers to your question.
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