We all know the routine before a vacation: lock the doors, set the alarms, unplug appliances. But there’s one simple, often-overlooked trick that can save you from coming home to nasty surprises—placing an upside-down glass and a piece of paper in your sink.
Why This Hack Works
- Prevents Dry Drain Traps & Sewer Gas
Your sink’s P-trap (the U-shaped pipe under it) holds water to create a seal, blocking sewer gases from rising into your home. If you’re away for weeks, that water can evaporate, breaking the seal and letting foul odors (or even pests) in.
The glass trick: Flipping a water-filled glass upside-down slowly releases water, keeping the trap sealed.
For longer trips: Add a teaspoon of mineral oil to slow evaporation even more.
- Acts as a Leak Detector
A sheet of paper (tissue, paper towel, or even a napkin) placed under the glass serves as a silent alarm.
Paper shredder
Sink stopper
If pipes leak while you’re gone, the paper will show water stains—alerting you to check for hidden damage.
- Deters Pests
A dry drain is an open invitation for insects, rodents, or even snakes to crawl up. Keeping the P-trap moist helps block their entry.
How to Do It Right
✅ Step 1: Fill a glass halfway with water.
✅ Step 2: Place a dry piece of paper in the sink.
✅ Step 3: Turn the glass upside-down over the paper.
✅ Step 4: Repeat for every sink & shower drain in the house.
Bonus Tip:
For extra protection, pour ½ cup of vinegar + 1 tbsp baking soda down drains before leaving to prevent clogs.
When This Trick Is a Lifesaver
Long trips (2+ weeks)
Best vacation packages
Dry climates (faster evaporation)
Older homes (prone to plumbing issues)
What Happens If You Skip It?
🚫 Sewer smells filling your home
🚫 Drain flies or bugs appearing
🚫 Hidden leaks causing water damage
Final Verdict
This $0 hack takes 10 seconds but can save you from costly repairs and nasty surprises. Next time you travel, don’t just lock up—leave a glass in the sink!