Black stains on the floor of toilets: The natural trick to remove them effortlessly. (Page 3 ) | June 24, 2025

Hence the interest in letting the citric acid work overnight. This trick works for all types of toilets: hanging or standing.

But also for all types of materials: porcelain, glazed ceramics or stainless steel.

Bonus Tips For descaling very scaled toilets, you can also count on soda crystals (Saint Marc or another brand)… or Coke!

Surprisingly, it works! Baking soda should be reserved for regular toilet maintenance.

But used alone, it is not strong enough to recover from a very dirty toilet.