Before leaving for vacation, most people remember to unplug appliances, lock up valuables, and shut off the water. But one area often overlooked is the sink—both in the kitchen and bathroom. Ignoring it can lead to musty odors, moisture buildup, or even insect infestations.

When a house sits empty, especially during warmer months, plumbing systems can dry out due to lack of use. This can allow sewer gases to creep in through the drains, creating unpleasant smells. The stagnant, damp environment can also attract pests like gnats, ants, or cockroaches through the pipes.

Fortunately, there’s a simple, free trick to prevent this: cover the drain with a paper towel and place an upside-down glass over it. This creates a barrier that helps block gases, insects, and odors.

Unlike standard sink stoppers—which can shift, warp, or lose their seal over time—this method is more reliable, especially for longer absences. The glass doesn’t need suction or a perfect fit, and it won’t move around easily.

Here’s how to prep your sink before you leave: