Why You Should Always Leave an Upturned Glass and a Piece of Paper in the Sink Before Going on Vacation
As you pack your bags, double-check your flight tickets, and lock the front door ahead of a long-awaited getaway, checking the kitchen sink is probably the last thing on your mind. But travel experts and clever homeowners swear by a quirky, low-tech trick involving an upturned glass and a piece of paper. Here is why you need to try it before your next trip.
Leaving for vacation? Discover why you should place an upturned glass and a piece of paper in your kitchen sink before you lock up.
The Unexpected Mystery of the Return Home
There is nothing quite like the feeling of returning home from vacation. You drag your suitcases through the front door, kick off your shoes, and look forward to sinking into your own bed.
However, coming home can occasionally deliver a nasty, uninvited surprise: plumbing odors, strange insects, or worse, unwanted pests that decided to move in while you were away.
While most travelers focus entirely on locking windows and setting security alarms, they often overlook the silent entryways scattered throughout the house. One of the most common pathways for uninvited creepy-crawlies and sewer gases is right under your nose—the kitchen sink drain. That is where the humble glass-and-paper trick comes into play.
The Clever Trick Explained
The concept behind this travel hack is brilliantly simple and serves a dual purpose: acting as an early-warning diagnostic tool and a physical barrier.
1. The P-Trap Evaporation Warning
Deep beneath your kitchen sink sits a curved piece of piping known as the P-Trap. Its specific U-shape is engineered to hold a small pool of standing water at all times, acting as a natural liquid seal that blocks foul sewer gases and pests from rising up out of the municipal plumbing and into your home.
However, if you are away on a two-week vacation and no water runs down your drains, the water inside that P-Trap can slowly evaporate. Once that water seal vanishes, sewer gases—or even roaches and silverfish—can crawl straight up your drain pipes into your kitchen.
2. The Upturned Glass & Paper Solution
Before you leave for your trip, take a clean glass, place a small piece of paper (or a sticky note/index card) over the mouth, and turn it upside down directly over your sink drain opening.
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If you return and the paper is undisturbed or slightly damp from condensation: Your P-Trap held its seal, and your plumbing remained safe while you were gone.
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If you return and the paper is chewed, pushed aside, or missing: You have an immediate visual indicator that something crawled up your drain pipe during your absence, alerting you to potential plumbing or pest issues before you unpack your kitchen groceries.
Comparative Analysis: Ignoring Your Drains vs. The Vacation Sink Hack
| Scenario | What Happens While You’re Away | Result Upon Returning Home |
| Leaving Drains Unchecked | P-trap water evaporates unnoticed; open pathways allow pests or gas entry. | Unpleasant mysterious odors or uninvited critters roaming your kitchen counters. |
| The Glass & Paper Trick | Paper acts as a physical shield and a tamper-evident seal over the drain. | Immediate visual confirmation of whether anything attempted to enter your home via the plumbing. |
Additional Plumbing & Kitchen Prep Before Vacation
To ensure your kitchen stays fresh and pest-free while you are away, pair the sink trick with a few extra pre-trip steps:
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Run a Little Water and Mineral Oil: Before locking up, run your faucets for a few seconds to top off all P-traps in the house. Pouring a tiny teaspoon of mineral oil down the drain can also slow down water evaporation significantly.
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Empty the Garbage Disposer: Never leave food scraps sitting in your garbage disposal. Run the disposal thoroughly, clean the rubber flaps, and take out the trash so you don’t return to fruit flies.
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Unplug Small Appliances: Protect your kitchen from unexpected power surges by unplugging coffee makers, blenders, and toasters.
Frequently Asked Questions
1. Can pests really crawl up a kitchen sink drain?
Yes. Certain pests, including drain flies, cockroaches, and even rodents in older municipal systems, can navigate dry or poorly maintained plumbing lines if the P-trap water seal evaporates entirely.
2. Is there an alternative if I don’t want to use paper and a glass?
You can use a rubber drain stopper if it creates an airtight seal, though the paper-and-glass method gives you a clear visual clue (“did something try to push through this?”) that a solid stopper won’t show.
3. How long does it take for a P-trap to dry out?
Under normal indoor conditions, a standard P-trap can lose its water seal through evaporation anywhere from 10 to 21 days, making it a real concern for longer vacations.
Action Checklist
What to Do:
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Place an upturned glass with a piece of paper over your kitchen and bathroom sink drains right before leaving for a trip.
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Run water down all household drains just before walking out the door to fill your P-traps.
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Empty all trash cans and clean out your garbage disposal.
What to Avoid:
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Leaving food debris or unwashed dishes in the sink while you are away.
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Ignoring your home’s plumbing systems when prepping for an extended vacation.
Preparing your home for vacation isn’t just about locking doors and turning down the thermostat—it’s about protecting every entry point. By leaving a simple upturned glass and a piece of paper in your sink, you gain instant peace of mind and ensure your return home is stress-free.