Use them separately, in sequence.
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.
