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Alan, it almost looks as if it was sandblasted at some point. It the damage is something like that no amount of solution bathing is going to fix it. If your resigned to it being a static display item, why not try a car polishing compound? Get a bit of the very fine paint polishing compound and try one spot. It will likely not removed the glass in the way of a glass polish, but could certainly remove clouded coating. Good luck.
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