Most people run through the usual checklist before leaving for vacation—adjust the thermostat, empty the fridge, water the plants, and double-check every lock. But there’s one tiny detail almost everyone forgets, and it can greet you with an unpleasant surprise the moment you walk back through the door. When a home sits untouched for days or weeks, an overlooked part of your plumbing can quietly cause lingering odors, making your return far less relaxing than you hoped.

Under the sink sits a P-trap, a curved section of pipe designed to hold a small amount of water at all times. That water acts as a protective barrier, stopping sewer gases and insects from traveling back up into your home. When you use your sinks daily, this barrier stays refreshed without you ever noticing. But during a long absence, the water can slowly evaporate, allowing odors to drift in and turning a harmless drain into an unexpected source of discomfort.

Fortunately, preventing this issue is incredibly simple. Before leaving, place a paper towel over the drain and set an upside-down glass on top to hold it in place. This creates a breathable, lightweight shield that blocks unpleasant smells and keeps insects from entering the pipe. It’s more reliable than rubber stoppers—which can loosen or warp—and requires nothing more than items you already have at home.

For an even fresher return, take one extra minute to clean the sink first. Rinse it with hot water, pour a small splash of vinegar down the drain to dissolve residue, and dry the basin. Then add the paper towel and glass trick. This quick, effortless step can make a surprising difference, helping your home stay clean-smelling and welcoming while you’re away. Sometimes the smallest precautions deliver the biggest comfort.