How the Upside-Down Glass Method Works
The method is straightforward. The paper towel covers the drain opening, while the inverted glass provides weight to help prevent the towel from moving.
This creates a temporary physical barrier over the drain. It may help reduce the movement of odors or small insects through the opening while the sink is not being used.
However, the method is not a replacement for properly maintained plumbing. If a sink regularly develops strong odors, drains slowly, or shows signs of a plumbing problem, it is better to investigate the underlying issue rather than simply covering the drain.
A Few Things to Do Before Leaving Home
Covering a drain can be one small addition to a broader vacation-preparation routine. Before leaving for several days, homeowners may also want to:
- Clean food residue from the sink and surrounding area.
- Take out household garbage.
- Check that faucets are fully closed.
- Make sure appliances are safely switched off where appropriate.
- Follow any recommended precautions for the home’s heating or cooling system.
- Check for obvious plumbing leaks.
- Secure doors and windows before leaving.
If the home will be vacant for an extended period, additional precautions may be appropriate depending on the property and local conditions.
What to Do When You Return
After getting home, simply remove the glass and paper towel and run water through the sink. Allowing water to flow through the drain also helps restore the water barrier in the trap.
If an unpleasant odor remains after the sink has been used, check for possible causes such as buildup, a dry trap, or a drainage problem. Persistent smells may warrant advice from a qualified plumber.
The upside-down glass trick is a simple household precaution rather than a guaranteed solution, but it can be an easy step to add to a pre-vacation cleaning and maintenance checklist.