How to Unstick Plastic Glasses


Plastic glasses can become stuck together if they are still wet when stacked, or if the glasses have been stacked together for a long period of time. Separating the plastic glasses can be difficult and may require more than just brute force. To prevent plastic glasses from becoming stuck in the first place, dry each glass thoroughly before putting it away and do not force plastic glasses together when storing. Instead, loosely stack them from smallest to largest.

Things You'll Need

  • Cooking oil
  • Teaspoon
  • Butter knife
  • Hammer

Water Method

  • Fill a sink with enough hot water to cover the bottom three inches of the bottom stuck glass.

  • Place the stuck plastic glasses into the sink upright.

  • Fill the top glass with ice water and allow the plastic glasses to sit for 20 minutes.

  • Remove the plastic glasses from the sink. Pull the glasses apart while twisting.

Oil Method

Knife Method

  • Wedge a butter knife in between the bottom plastic glass and the one above it to allow air to flow and release the vacuum lock.

  • Pull the bottom plastic glass away while twisting.

  • Repeat for remaining stuck glasses.


  • Place the stuck plastic glasses into the freezer and allow them to sit for 30 minutes.

  • Remove the glasses from the freezer.

  • Tap the rim of the bottom glass with the wood handle of a hammer until the glasses separate.

Tips & Warnings

  • The idea of using hot and cold water to separate plastic glasses is due to the properties of this material. The heat of the hot water causes the bottom glass to expand, while the chill of the cold water results in the top glass contracting.

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  • Photo Credit Jupiterimages/Polka Dot/Getty Images
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