In time, a cloudy film can accumulate on the inside and outside of plastic drinking glasses. This can make the plastic glasses appear to be dirty. Placing the plastic glasses in a dishwasher or scrubbing them will remove bacteria, but these cleaning methods may not remove the cloudy appearance from the glasses. White vinegar, however, is a product that can be used to remove the cloudy look from your plastic drinking glasses.
Pour 1 cup of distilled white vinegar into a container.
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Place one cloth into the container so that the entire cloth is saturated by the distilled white vinegar.
Stuff the wet cloth into the plastic glass. Make sure that the entire inside of the glass is stuffed with the wet cloth.
Repeat steps 1 and 2 using a second cloth.
Wrap the wet cloth around the entire outside of the plastic glass. An easy way to do this is to set the cloth down on a flat surface (such as a table) and roll the cloth around the plastic glass.
Allow the glass to sit with one cloth inside and one cloth wrapped around the glass overnight.
Rinse the inside and outside of the plastic glass with cool water.