The Simple Sink Trick Travelers Swear By—Why an Upside-Down Glass Can Make a Big Difference

unused drains can become a source of stale smells as plumbing traps slowly dry out, especially in warm weather. Moisture lingering around the drain can also create an inviting environment for tiny insects looking for an easy way indoors. Fortunately, preventing these problems costs almost nothing and takes less than a minute before you leave.

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