Treatments for discolored glass
To clean severely discolored glass or crystal, soak the item in a solution of ammonia and water for several hours, then wash and rinse.
Another way to clean badly discolored glass is to soak it in vinegar with the contents of a tea bag, then wash and rinse.
Sometimes badly discolored glass can be restored by soaking it in acetone (in a well-ventilated area) for a few hours. Wash and rinse before using.
A glass cruet or decanter that has been used to store vinegar or wine for years will discolor from the chemicals in the liquid. If you can’t remove the discoloration, you can at least hide it and still use the container for decorative purposes. Place the container in a 140°F oven for a few minutes. (This heat is less than what you subject your dishes to when you wash them, so it’s safe, but don’t let the oven get any hotter than that, or the glass will break.) Remove the container with an oven mitt, put a couple of tablespoons of vegetable oil in it and shake to coat. Place the container upside down and leave for 2 to 3 days until all the oil has drained out except for a thin film on the inside of the glass. Wipe off the neck with a paper towel. The glass will look like new.

Remove stains from inside the vases, pitchers and bottles
To remove stains inside vases, pitchers and bottles, apply acetone with a rag. (When using acetone, always be sure your work area is well ventilated.) If the neck of the object is too narrow to reach inside with a rag, pour in the acetone, add a little sand and swish the mixture around. Empty out the acetone and sand, then wash and rinse.

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