To remove thick limescale and urine deposits from the toilet bowl, a chemical reaction is necessary—more precisely, the action of acids that dissolve mineral deposits.

Here you will find an overview of the most effective methods, from natural remedies to powerful chemical solutions.

💡 IMPORTANT FIRST STEP: Remove the Water
Before applying any cleaner, squeeze most of the water out of the bottom of the bowl with a toilet brush (using quick up-and-down motions) or pump it out using an old hairdryer pump or a sponge, for example.

The cleaner does not dissolve in water and acts directly and undiluted on the deposits.

Natural and Gentle Method (for light to medium deposits): Citric Acid + Hot Water
Citric acid is extremely effective against limescale and leaves no chemical odor.

Pour 100–150 g of citric acid powder into the empty bottom of the toilet bowl.

Add about 1 liter of hot water (not boiling, to avoid cracking the ceramic – ideally around 60–70 °C).

Let the mixture work for at least 3–5 hours, preferably overnight. Then clean the bowl with a brush and rinse thoroughly.

Vinegar + Baking Soda (Step-by-Step Application):

Pour 1 liter of fermented vinegar into the toilet bowl and sprinkle a few tablespoons of baking soda over it.

Place toilet paper soaked in vinegar on the areas above the surface (to absorb deposits) to prevent them from drying out and allow the acid to work.

Let the mixture work overnight and clean the bowl mechanically the next morning.

Especially Effective Chemical Method (for Old and Stubborn Deposits):

If natural methods haven’t worked, use specialized products:

Hydrochloric Acid (HCl):
The ultimate solution for stubborn deposits.

Procedure: Pour approximately 200–300 ml directly into the toilet bowl, let it sit for 15–30 minutes, and then flush.

Warning: Always ensure good ventilation, wear gloves, and avoid inhaling the fumes.

Special acid-based gel cleaners: Look for cleaners containing sulfamic acid, formic acid, or hydrochloric acid (e.g., Savo for Limescale, W5 Maxx Power, Bref 10x Effect).

Gels drain slowly and therefore remain effective on the walls of the toilet bowl for longer.

Mechanical cleaning without scratches: If small limescale deposits remain after chemical treatment:

Pumice stone for the toilet: A special mineral cube with a handle. Soaked in water, it is softer than the ceramic of the toilet bowl and removes limescale deposits without damaging the glaze.

Microfiber cleaning pad / Teflon scouring pad: Never use conventional metal scouring pads, as these would irreparably damage the glaze.

⚠️ What you should avoid: Mixing Sava (hypronate) with acids (vinegar, hydrochloric acid): This produces dangerous and toxic chlorine gas! Chlorine-based bleaches (classic Savo): Bleach does not dissolve limescale deposits, it only lightens them. The residue remains in the bowl and continues to attract dirt.