Possible Etching
I agree with bjeanj about etching. Sometimes glassware and dishes that appear to have a soap film on them have really been “etched.” Etching is the erosion of the surface of glassware, causing tiny pits or scratches on the glass. To determine if your dishes are etched or if they are simply coated with mineral & soap build up: Put some lemon juice on a small area of the effected glassware & allow it soak for 5-10 minutes then wash it off. Allow the glass to dry. If that spot you put the lemon juice on is much cleaner than rest of the glass than it is not etched & can be restored. If the spot you put the lemon on looks unchanged then it is most likely etched and cannot be restored.
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