Another culprit is a worn-out flapper—that rubber thingy at the bottom of your toilet tank. When it leaks, water slowly trickles into the bowl, diluting the cleaning chemicals and letting bacteria grow.
Bacteria love a warm, damp party, and they produce stinky gases as their leftovers. It’s like they’re having a rave in your toilet, and you’re not invited—but you smell the aftermath.
Replace that flapper for a few bucks, and you’ll silence the bacteria rave. Your nose will thank you.