Before leaving for vacation, most people check the doors, windows, appliances, and valuables, but one small part of the home is easy to overlook: the sink. When a house sits empty for several days, the water inside the plumbing trap beneath a sink can slowly evaporate, especially during warm weather. That water normally acts as a barrier against sewer gases, so when the trap becomes too dry, unpleasant odors can travel through the pipes and into the home. Unused drains can also become potential entry points for small insects looking for moisture.

Fortunately, there are a few simple precautions you can take before leaving. Run water through the sink shortly before departing to make sure the plumbing trap contains fresh water. You can also place a temporary cover over an unused drain to create an additional physical barrier. An upturned glass over the drain can serve this purpose, while a small piece of paper can act as a reminder to remove the cover when you return. The setup is only an extra precaution and does not replace proper plumbing maintenance.

For longer trips, don’t forget about other drains throughout the house. Bathroom sinks, showers, tubs, and floor drains can also contain traps that may dry out when they remain unused. Keeping these areas clean and ensuring the traps contain water can help reduce unpleasant smells and discourage unwanted pests. Before leaving, it’s also wise to make sure the sink and surrounding area are clean and dry.

Ultimately, there’s no mysterious secret behind the trick—it’s simply an easy bit of home maintenance that many people forget. Locking the doors and turning off the lights is important, but your plumbing still needs attention while you’re away. Taking a few minutes to run water through unused drains and add a temporary barrier can help make your return much more pleasant. Sometimes, the smallest preparations are the ones you appreciate most when you finally walk back through the door.