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I would strongly caution the use of sandpaper of ANY grit. Easier to get more agressive if less-intrusive solutions don't work.
Google Novus, for something well-regarded in a chemical cleaner. Or, try jeweler's rouge or tooth paste.
Or replace it. Some folks make their own, with carved forms to heat plastic sheets over.
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Experience is what you get when you don't get what you wanted.
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