How to clean an electric kettle: descale with vinegar or citric acid

Step by step: how to clean an electric kettle

Safety first. Unplug the kettle and let it cool before you clean it. Never put the base, cord or the kettle’s electrical contacts in water. Boiling vinegar gives off strong fumes, so run the range hood or open a window, and never mix vinegar with bleach.

1. 1

   Unplug and empty the kettle

   Lift the kettle off its base, pour out any water and let it cool if it was recently used. Look inside: white or tan crust on the bottom and heating plate is limescale, minerals left behind as hard water boils off.

2. 2

   Fill with vinegar and water

   Pour in one part white vinegar to between one and three parts water, enough to cover the scale and at least reach the minimum line. Use the stronger mix for thick scale. KitchenAid’s own instructions use both ratios, so either works.

3. 3

   Boil, then let it stand

   Put the kettle on its base and bring the solution to a boil. Unplug it and leave it to stand for at least an hour, or overnight for heavy scale. You should see the crust soften, flake or dissolve.

4. 4

   Pour out and scrub loose scale

   Pour the solution down the sink. Wipe the inside with a soft sponge or bottle brush to lift anything that is left. If stubborn spots remain, repeat the soak instead of scraping with anything metal.

5. 5

   Clean the spout filter

   Many kettles have a removable mesh filter inside the spout that catches flakes. Slide it out, soak it in a small bowl of the same vinegar mix for 15 to 30 minutes, then rinse and brush it gently. Put it back before you boil water again.

6. 6

   Boil fresh water two or three times

   Fill the kettle with clean water, bring it to a boil and pour it away. Repeat twice more to clear any vinegar smell or taste. The kettle is ready when boiled water smells like nothing.

7. 7

   Wipe and dry the outside

   Wipe the outside with a damp cloth and a drop of dish soap, then dry and buff with a soft cloth. On stainless steel, wipe in the direction of the grain to hide streaks. Keep water away from the base connector.

Vinegar, citric acid or descaler: which should you use?

Any mild acid dissolves limescale; pick by how much scale there is and how much smell you can tolerate. KitchenAid’s support page recommends a commercial descaler first and gives vinegar as the fallback, while its kettle cleaning guide also lists lemon juice and citric acid.

Baking soda is alkaline, so it is better for stains and smells than for limescale, which needs an acid.

How to clean a stovetop tea kettle

Descale a stovetop kettle the same way, with heat from the burner instead of a base: fill it with half vinegar and half water, bring it to a boil, turn off the heat and let it sit for an hour, then rinse and boil fresh water once or twice.

• Stainless steel outside: a paste of baking soda and water, or a cleanser such as Bar Keepers Friend, lifts heat tint and burnt-on spills. Rub with the grain and rinse.
• Enameled kettles: use dish soap and a soft sponge only. Abrasive powders and pads dull and scratch enamel.
• Copper kettles: follow the maker’s care guide; copper polish is not for the inside.
• Whistle and lid: wash in warm soapy water and dry before you put them back.

Never let a stovetop kettle boil dry. If it does, let it cool on the burner before you touch it, and check the bottom for warping.

How often should you descale a kettle?

Every one to three months for most homes, and monthly if you have hard water or boil several times a day. KitchenAid notes that the interval depends on how hard your water is.

The US Geological Survey explains that hardness comes from dissolved calcium and magnesium, and classes water above 120 milligrams per liter as hard. Your water utility’s annual report lists your number. Signs it is time: visible white crust, flakes floating in your tea, a rattling or louder boil, or a kettle that takes longer to boil than it used to. If your coffee maker scales up at the same rate, see how to clean a coffee maker.

Mistakes to avoid

• Dunking the whole electric kettle in the sink, which can ruin the electrical contacts.
• Scraping scale off the heating plate with a knife or steel wool.
• Skipping the fresh-water boils, so the next cup of tea tastes of vinegar.
• Forgetting the spout filter, which keeps shedding flakes into your mug.
• Using abrasive cleanser on an enameled or painted kettle.