The Clean Lab

Close-up of a pink mineral ring forming at the waterline inside a toilet bowl

What That Mysterious Pink Residue in Your Guest...

That pink ring at your waterline isn't rust — it's bacteria feeding on mineral scale. Here's why bleach can't fix it, and what actually breaks the cycle.

What That Mysterious Pink Residue in Your Guest...

That pink ring at your waterline isn't rust — it's bacteria feeding on mineral scale. Here's why bleach can't fix it, and what actually breaks the cycle.