The Clean Lab

Close-up of a chalky calcium ring along a toilet waterline next to a wet pumice stone and citric acid crystals

Citric Acid vs. Pumice Stone: What Actually Dis...

Pumice stone scrapes calcium off your toilet; citric acid actually dissolves it. Here's which one really works on hard water rings, and why they keep coming back.

Citric Acid vs. Pumice Stone: What Actually Dis...

Pumice stone scrapes calcium off your toilet; citric acid actually dissolves it. Here's which one really works on hard water rings, and why they keep coming back.