Kettle Descaler
A citric acid or vinegar boil that dissolves limescale from electric and stovetop kettles
30 min beginner Yields 1 treatment
Ingredients
- 2 tbsp Citric acid (or substitute 1 cup white vinegar)
- enough to fill kettle halfway Water
- 1 Soft sponge (non-abrasive)
Steps
- Fill the kettle halfway with water.
- Add 2 tablespoons of citric acid (or 1 cup white vinegar).
- Bring to a full boil.
- Turn off heat and let sit 15-20 minutes.
- If scale remains, repeat the boil-and-soak.
- Wipe the interior with a soft sponge to remove loosened flakes.
- Rinse at least 3 times with clean water.
- Boil once with fresh water and discard to clear any residual taste.
Why It Works
Citric acid is triprotic — it donates three hydrogen ions per molecule, making it highly effective at dissolving calcium carbonate. The reaction produces water-soluble calcium citrate and CO2. Citric acid is preferred over vinegar for kettles because it is odorless and tasteless.
Tips
- Citric acid powder is in the canning section of grocery stores. Shelf-stable for years.
- For electric kettles with concealed elements, this is the only safe cleaning method.
- Descale monthly in hard water areas.
- Empty the kettle after each use — standing water deposits more scale.
- Lemon juice works in a pinch but requires about 1/4 cup to match 2 tablespoons of powder.