How to Descale an Electric Kettle (Vinegar or Citric Acid)
Remove white scale from an electric kettle in about 30 minutes with vinegar or citric acid, plus how often to do it and how to keep scale from coming back.
That chalky white crust inside your kettle is limescale: calcium and magnesium left behind as hard water boils. It isn’t harmful, but it makes your kettle slower and louder, flakes into your tea, and can shorten the kettle’s life.
Removing it is easy and cheap. You’ll need either white vinegar or citric acid.
Before you start: check your kettle’s manual. Some makers recommend a specific descaler or method, and following it protects your warranty.
What you’ll need
- White vinegar or citric acid powder (sold for canning or cleaning)
- Water
- A soft cloth or sponge
- A soft brush, for the spout filter
Method 1: Vinegar
- Fill the kettle about halfway with equal parts white vinegar and water. Make sure the heating element or the bottom is covered.
- Bring it to a boil, then switch it off.
- Let it sit for 30 minutes to an hour. For heavy scale, leave it longer.
- Pour it out and wipe the inside with a soft cloth. Most scale will wipe right off.
- Rinse well, then fill with clean water, boil and pour it out. Do this two or three times to get rid of the vinegar taste.
Open a window. Boiling vinegar smells strong.
Method 2: Citric acid
Citric acid works as well as vinegar and doesn’t leave a smell.
- Dissolve about 1 to 2 tablespoons of citric acid in a full kettle of water, about a liter.
- Boil it, then switch it off and let it sit 15 to 30 minutes.
- Pour it out, wipe the inside, and rinse.
- Boil and discard clean water once or twice.
Lemon juice works in a pinch, though it’s weaker than citric acid powder.
Don’t forget the filter and spout
Many kettles have a removable mesh filter in the spout. Take it out, soak it in the vinegar or citric acid solution, and scrub it gently with a soft brush. For gooseneck kettles, pour the cleaning solution through the spout to clear scale inside it.
What not to do
- Don’t use abrasive scrubbers or steel wool on the inside. They scratch stainless steel and can damage coatings.
- Don’t submerge the kettle or its base in water. Wipe the outside with a damp cloth.
- Don’t use bleach or harsh chemical cleaners.
How often to descale
| Your water | How often |
|---|---|
| Soft water | Every 2 to 3 months |
| Moderately hard | Monthly |
| Very hard | Every 1 to 2 weeks |
If you can see white scale or flakes, it’s time.
How to keep scale away
- Empty the kettle after each use instead of leaving water to sit.
- Boil only what you need.
- Use filtered water. A water filter pitcher cuts down on scale. If hard water is a problem throughout your house, a water softener solves it at the source.
Questions people ask
Is limescale in a kettle harmful? No. It’s mostly calcium and magnesium, the same minerals in hard water. It just affects taste and performance.
Can I descale a kettle with baking soda? Baking soda helps with stains and odors, but an acid like vinegar or citric acid is what dissolves scale.
Looking for a new kettle? See the best electric kettles without plastic.