I have clear glass that had a colored film on it for about 50 years. When I removed the film, the glass was discolored.
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Our chief conservator suggests the approach he uses for tough stains on Pyrex glassware.
He adds that this approach "should just take one application, and a few seconds."
You also might be interested in the book Conservation and Care of Glass Objects by Stephen Koob, which includes a chapter on cleaning glass.
Please do not hesitate to contact us with your glass-related questions in the future!
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