Leaving an upturned glass and a piece of paper in the sink before going on vacation is a simple household trick mainly meant to help you notice and prevent problems while you are away. It is not a universal rule, but it can be useful for a few reasons:
1. It helps detect leaks or water problems
Before leaving, you can place a dry piece of paper (such as a paper towel or sheet of paper) under or near the glass in the sink. If a pipe starts dripping, a faucet leaks, or water backs up while you are gone, the paper may show water marks when you return.
A small leak can create damp conditions that encourage Mold growth, which can damage surfaces and create unpleasant odors.
2. It helps prevent dirty sink odors
An upside-down glass can cover the drain opening area and reduce the chance that smells from the drain rise into the kitchen or bathroom. Drains can collect food particles, soap residue, and organic material that produce odors over time.
A better method is also to:
- clean the sink before leaving,
- rinse the drain,
- remove standing water,
- empty the trash,
- and wipe away moisture.
3. It can reveal unwanted visitors
The paper can act as a simple indicator of activity:
- water stains may show plumbing issues,
- dirt marks may suggest insects or other small pests have been around.
Kitchen pests such as Fruit flies are often attracted to leftover food residue, so cleaning the sink area before a trip is more effective than the glass trick alone.
4. It gives you a quick “before and after” check
When you return, the condition of the paper and glass can tell you whether something changed:
- Paper is wet → investigate leaks.
- Paper is dirty or moved → check for pests or airflow issues.
- Glass is unchanged → likely everything stayed dry.
What you should do before vacation (better prevention checklist)
- Wash and dry the sink completely.
- Put a little baking soda and water down the drain, then rinse if needed.
- Empty garbage and compost bins.
- Check faucets and pipes for drips.
- Turn off the water supply if you will be away for a long time.
- Leave the sink dry.
So, the glass and paper trick is mostly a low-cost warning system, not a magical prevention method. The real benefit comes from leaving your sink clean, dry, and easy to inspect when you return.