Sometimes, the smell isn’t gas—it’s life. Bacteria and mold love dark, damp places like your drain pipe. They form a slimy film called biofilm.
When water runs, it stirs up this gunk and releases a musty, swampy odor. It’s totally natural, but it’s also totally fixable. You’re not gross; you just have a tiny, stinky ecosystem in your sink.
How to Kick Biofilm Out
Pour a cup of white vinegar down the drain. Let it sit for 30 minutes, then flush with hot water. That acid breaks down the slime like a superhero.
Why Does My Bathroom Sink Smell When I Run Water: Easy Fixes! - Vacuum
Baking soda works too—half a cup, then follow with vinegar. Watch it fizz! It’s science you can smell working. Repeat monthly and you’ll stay ahead of the funk.
