A Viral Travel Hack Sounds Smart—But Does It Really Work?

Before heading off on vacation, most people remember to lock the doors, unplug electronics, and take out the trash. But recently, another travel tip has been gaining attention online: cover your sink drain with a sheet of paper and place an upside-down glass over it before leaving home.

According to social media posts, this simple trick can help stop unpleasant odors and even prevent insects from entering your home while you’re away.

It sounds like an easy solution—but does it actually work?

The answer is a little more complicated. While the idea is based on a real plumbing principle, professional plumbers say it isn’t the most reliable way to protect your home. Understanding how your plumbing system works can help you choose a much more effective solution before your next trip.

Why Sink Drains Can Cause Problems While You’re Away

Most people don’t think much about what happens beneath their sinks.

Hidden under every sink, shower, bathtub, and many floor drains is an important plumbing component called the P-trap.

This U-shaped section of pipe performs a simple but essential job.

It always holds a small amount of water.

That water acts as a natural barrier between your home and the sewer system, helping to:

• Block unpleasant sewer odors
• Prevent sewer gases from entering your home
• Keep small insects and pests from traveling up through the drain

As long as water remains inside the P-trap, it continues protecting your home without you ever noticing.

What Happens During a Long Vacation?

The problem begins when a drain isn’t used for an extended period.

Normally, every time you wash your hands, take a shower, or run water down the sink, the water inside the P-trap is refreshed.

But if you’re away on vacation for several weeks, the water can slowly evaporate.

This happens even faster in:

• Hot climates
• Dry weather
• Homes with low indoor humidity
• Guest bathrooms or rarely used sinks

Once enough water evaporates, the protective seal inside the P-trap becomes weaker.

Without that water barrier, sewer odors, gases, and even tiny insects may have a path back into your home.

The Viral Paper and Glass Hack

One popular internet tip suggests covering the drain opening with:

• A sheet of paper
• An upside-down drinking glass placed over it

The idea is that this creates another barrier, helping keep smells and insects from entering the house while you’re away.

At first glance, the trick seems logical.

However, plumbing professionals point out several reasons why it isn’t a dependable long-term solution.

Why Experts Don’t Recommend This Method

Although the hack is based on a real plumbing concept, it has several weaknesses.

It Doesn’t Create an Airtight Seal

A regular drinking glass simply rests on top of the sink.

Small gaps around the edges often remain, allowing odors or tiny insects to pass through.

Paper Can Become Damp

Paper naturally absorbs moisture from the air.

Over time it may soften, wrinkle, or shift out of place, reducing its effectiveness.

It Doesn’t Solve the Real Problem

The biggest issue isn’t the drain opening itself.

The real protection comes from the water inside the P-trap.

If that water evaporates, simply covering the drain from above doesn’t restore the missing barrier underneath.

Better Ways to Prepare Your Home Before Traveling

Fortunately, there are several simple steps that plumbing professionals recommend instead.

1. Run Water Through Every Drain

Before leaving, turn on the water in every:

• Bathroom sink
• Kitchen sink
• Shower
• Bathtub
• Utility sink
• Floor drain

Running water for a few seconds refills every P-trap with fresh water, restoring its protective seal.

2. Close Built-In Drain Stoppers

If your sink has a built-in stopper, close it before leaving.

This adds another layer of protection against odors while the P-trap continues doing its job.

3. Use Rubber or Silicone Drain Covers

Instead of paper and a glass, use drain covers that are specifically designed to fit tightly over the opening.

These create a much better temporary seal and are less likely to move or allow insects through.

Some homeowners also place plastic wrap beneath a stopper to improve the seal even further.

4. Use Mineral Oil for Longer Trips

If you’ll be away for several weeks or even months, many plumbing experts recommend one additional step.

After running fresh water into the drain, pour a small amount of mineral oil into each one.

The mineral oil floats on top of the water inside the P-trap.

This thin layer slows evaporation, helping the water barrier remain effective for a much longer time.

It’s a simple trick that’s widely recommended for vacation homes and properties left vacant for extended periods.

Extra Tips Before Leaving Home

While preparing your drains, it’s also a good idea to complete a few other quick household tasks.

Before leaving, consider:

• Emptying indoor trash cans.
• Cleaning food scraps from the kitchen sink.
• Running the garbage disposal with water.
• Checking for slow leaks under sinks.
• Ensuring all drain covers fit properly.
• Making sure bathroom drains are clean.

These small steps can help reduce odors and prevent unwanted surprises when you return.

Is the Viral Sink Hack Worth Trying?

The paper-and-glass method isn’t completely without logic.

It recognizes that odors and insects can enter through drains if the protective water seal disappears.

However, professional plumbers generally agree that it’s not a dependable solution because it doesn’t create a secure seal or address the underlying cause of the problem.

Maintaining the water inside your P-traps and using properly fitted drain covers is a much more effective approach.

Final Thoughts

The viral sink-covering trick may seem like an easy vacation hack, but it’s only a temporary idea based on a much bigger plumbing principle.

The real key to keeping unpleasant odors, sewer gases, and small pests out of your home is making sure the P-traps stay filled with water. Before you leave, take a few minutes to run water through every drain, close any built-in stoppers, and use properly fitting drain covers if needed. If you’re planning an extended trip, adding a small amount of mineral oil can help slow evaporation and keep the water seal intact for longer.

A little preparation before you travel can go a long way toward keeping your home fresh, protected, and ready for your return.

Note: All images used in this article are AI-generated and intended for illustrative purposes only.