Have you ever noticed a little hole near the faucet in your bathroom sink and wondered if it’s just an unnecessary feature? You’re not alone — many have thought the same. But, surprisingly, this tiny opening plays a rather important role.

This hole is cleverly designed to be much more than a mere ornament. It’s positioned strategically, about a third of the way up the basin, to serve as a preventive measure foresighted by the sink’s designer. It stands ready for various scenarios that users might inadvertently cause.

The small hole is actually an overflow safeguard, connected to the drainage system beneath the sink. Let’s say you start filling the sink and then get distracted by a phone call or some other task — before you know it, the water might be reaching the top. When the water reaches about two-thirds of the sink’s height, it flows into this hole and out through the drainage, helping to prevent any accidental flooding of your bathroom floor.

Even though this feature is a lifesaver, it does come with a little caveat. Because of its location, it can sometimes become a haven for bacteria and mold, which can lead to unpleasant odors emanating from it.

If you catch a whiff of an odd smell around your sink, especially near this small hole, there’s a simple remedy. A combination of vinegar and baking soda can work wonders. Just mix them up and pour the mixture into the overflow hole.

This simple trick initiates a chemical reaction that can effectively clear away dirt. Allow it to sit for about 5 to 10 minutes. After that, flushing the system with warm water will finish the process, ensuring your bathroom smells fresh and remains clean.