You may have come upon some older glassware that has cloudy stains on it. These stains can be caused by hard water and standard dish soap, or dishwashers might not remove all of the cloudy stains from the glassware. Cloudy dishware is still usable, but the glasses will not have their original clear appearance. Use a common liquid to remove cloudy stains as well as bacteria you find on your glassware.
Soak roughly four paper towels in undiluted white distilled vinegar.
Stuff the soaked paper towels inside of the glassware. If the inside of the glassware is not fully covered in the paper towels, soak more paper towels and stuff them inside the glassware.
Soak four (or more) paper towels in undiluted white distilled vinegar once more.
Wrap the soaked paper towels around the outside of the cloudy glassware. Soak more paper towels if they do not fully cover the outside of the glassware.
Leave the towels on the outside and inside of the glassware for one hour.
Remove the towels, and rinse the inside and outside of the glassware thoroughly with distilled bottled water.
Dry the glassware with a lint-free cloth, or allow the glassware to air dry.
Fill the inside of the glassware with white distilled vinegar if you cannot fit towels inside the glassware.