Here’s how:
Flush to lower water level (or use a cup to remove some water).
Pour 2 cups of white vinegar directly onto the stain. Let sit 30–60 minutes (vinegar dissolves minerals and uric acid).
Sprinkle baking soda over the area—it creates a gentle abrasive foam when it hits residual vinegar.
Scrub with a toilet brush (use an old toothbrush for under the rim).
Flush.
For tough stains: Soak paper towels in vinegar, press them onto the stain above the waterline, and leave overnight.
For Really Stubborn Stains: Pumice Stone (Yes, Really!)
A wet pumice stone (made for toilets—not the facial kind!) is safe on porcelain and glides away mineral buildup without scratching.
Wet the stone and the bowl.
Gently rub the stain in small circles.
Rinse.
