Most bathroom sinks have a small hole near the faucet called an overflow hole. It’s not just decorative—it helps prevent flooding by allowing water to drain if the sink fills too high, like when someone forgets to turn off the tap.
However, this hole can collect bacteria and mold, causing bad odors. To clean it, pour a mix of vinegar and baking soda into the hole. Wait 5–10 minutes, then flush with warm water to keep your sink fresh and odor-free.