Written by Sara Ibrahim. Sara researches home and kitchen products for Cupindy. · Published October 2026 · Last reviewed October 11, 2026
White crust, flakes in your tea, slower boiling: that's scale. Kettle makers don't all agree on how to remove it, so here's what seven of them say.
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Our quick pick
Essential Values Citric Acid Descaler, 2 lb
Pure citric acid, one of the two descalers Fellow names for kettles, in a 2 lb tub. The listing names kettles too.
See the citric acid descaler on AmazonThe short answer
- Use: a kettle descaler or citric acid. Fellow's ratio is 2 spoonfuls of citric acid in 500 mL of water.
- Vinegar: only if your manual allows it. OXO's allows only water and descaling products.
- Then: boil, let it sit, empty, and boil fresh water once or twice to rinse.
- How often: about monthly with hard water, every 2 to 3 months with soft (Fellow).
| Pick | Best for | Link |
|---|---|---|
| Essential Values Citric Acid Descaler, 2 lb | Most electric kettles | Amazon |
| OXO Descaling Solution | OXO kettles (OXO's manual names its own) | Amazon |
| Cosori Stainless Kettle, 1.7 L | Replacing a kettle that's past saving | Amazon |
How we put this together: on October 10-11, 2026 we read five kettle manuals, Fellow's and KitchenAid's care guides, and the ingredient sheet for OXO's descaler. We haven't tested these products.
How to Descale an Electric Kettle With Citric Acid
Dissolve citric acid in the kettle, boil, let it sit, empty it, then boil fresh water to rinse. Fellow, which makes electric kettles: “Remove limescale by heating a diluted vinegar or citric acid solution in the kettle, letting it sit for at least 30 minutes, and then rinsing thoroughly.”
- Mix the solution in the kettle. “Alternatively, combine 500 mL of water with 2 spoonfuls of citric acid.” Stay under the MAX line.
- Bring it to a boil, then switch off and unplug.
- Let it sit at least 30 minutes (Fellow). With a bottled descaler, follow the label instead.
- Empty it and take out the spout filter. Rinse the filter under running water.
- Boil fresh water and pour it away. Fellow: “Then fill the kettle with clean water, bring it to a boil, and discard the water.”
- Scale still there? Fellow's advice: “repeat the descaling process rather than scrubbing the interior more aggressively”.
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Our pick
Essential Values Citric Acid Descaler, 2 lb
A tub of citric acid powder; the listing says “100% citric acid” and names kettles alongside water distillers.
Good for: kettles whose maker names citric acid (Fellow, KitchenAid) or allows a descaler (Cuisinart, Breville, Smeg)
The drawback: it's written for water distillers first, so there's no kettle dose on the listing (use Fellow's ratio), and the brand publishes no safety data sheet that we could find.
See it on AmazonCan You Descale a Kettle With Vinegar? What 7 Makers Say
Yes, if your manual allows it. Five makers allow vinegar (Cuisinart, Breville, Smeg, Fellow, KitchenAid), four name a descaler first, and OXO and Hamilton Beach never mention it. OXO's manual goes furthest: “Do not put any substances other than water and descaling products into the Kettle.”
| Maker | What it says to use | How often |
|---|---|---|
| OXO | Descaling solution only, at least 5 minutes | “every 60 uses” |
| Cuisinart | A kettle descaler; if you have none, white vinegar about ½ inch deep, boiled | Depends on your water and use |
| Breville | A kettle descaler, or 1 part vinegar to 2 parts water, overnight | Not stated |
| Smeg | Descaling products, or 0.1 to 0.5 L vinegar in 1 L of boiled water, overnight | More often if used daily |
| Hamilton Beach | ½ teaspoon cream of tartar, kettle half full, boiled | Not stated; empty it after each use to limit scale |
| Fellow | Equal parts vinegar and water, or citric acid | Monthly with hard water; 2-3 months with soft |
| KitchenAid | About one cup of white vinegar, boiled and left overnight | About monthly with daily use |
Two warnings matter more than the ratios. OXO: “The warranty is voided if descaling is not carried out in accordance with these instructions.” Smeg: “Do not use descaling products for cleaning bathrooms or kitchens or products that contain perfumes.” America's Test Kitchen, which isn't a kettle maker, says vinegar “can actually be damaging” and uses a citric acid descaler instead.
If you do use vinegar, KitchenAid's routine is typical: “Bring the vinegar and water mixture to a boil and allow to stand overnight before emptying the solution.” Then boil and discard plain water twice.
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For OXO kettles
OXO Brew Descaling Solution
OXO's Clarity kettle manual says “We recommend using OXO On Descaling Solution”. OXO's descaler is sold on Amazon as OXO Brew Descaling Solution, and its listing names kettles.
Good for: OXO kettle owners who want to stay inside OXO's instructions
The drawback: it isn't only citric acid. The ingredient sheet its maker, Urnex, publishes lists water, citric acid and alkyl dimethylbenzyl ammonium chloride, a quaternary ammonium compound listed as a cleaning agent.
See it on AmazonHow to Clean the Outside, the Filter and the Base
- Filter: lift it out and rinse it under running water. Hamilton Beach and Smeg say to use a soft brush.
- Outside: wipe with a damp cloth and dry. Breville: “Do not use chemicals, alkaline cleaning agents, steel wool or abrasive cleaners to clean the inside or outside of the kettle.”
- Base and cord: unplug and let it cool first. Fellow: “Avoid submerging it in water or cleaning solutions.”
- No dishwasher. OXO: “Do not clean any part of this appliance in the dishwasher.” Smeg says the same.
Hard water is why scale keeps coming back. If it's building up fast, our water softener guide explains the fix at the tap.
Brown Spots, Rust or White Flakes: Descale or Replace?
White, chalky crust is scale. The US Geological Survey explains it: “When hard water is heated, such as in a home water heater, solid deposits of calcium carbonate can form.” Descale it.
A brown or rainbow tint on a steel base is usually not damage. Hamilton Beach: “It is normal for stainless steel heating elements to discolor.” “This does not affect the performance of the kettle.”
Consider replacing it if it still switches off before boiling after you've descaled it as the manual says (Smeg lists scale as one cause), if rust or pitting won't come off, if it leaks at the base or the glass is cracked, or if your model is recalled (search cpsc.gov).
If you replace it, check what touches the water, not just the outside. Our guide to non-toxic tea kettles goes through the gasket, the window and the spout filter part by part.
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If you're replacing it
Cosori Stainless Steel Electric Kettle, 1.7 L
The listing names 304 stainless steel for the spout, inner lid and filter, and uses water-level marks inside the kettle instead of a plastic window.
Good for: replacing a worn-out kettle or one with a plastic water window
The drawback: the listing doesn't say what the lid gasket or the base seal are made of.
See it on AmazonQuestions People Ask
Is limescale in a kettle harmful?
The US Geological Survey calls hard-water residue “not dangerous, but unsightly.” Kettle makers still say to remove it because it slows heating.
Can I descale a kettle with lemon juice?
KitchenAid says “You can also clean the interior of your kettle using lemon juice, citric acid, baking soda or flat soda.” None of the five manuals we read suggests lemon for descaling.
What about baking soda?
KitchenAid lists it for the inside: 1 to 2 tablespoons, boiled. Hamilton Beach's manual uses cream of tartar instead: ½ teaspoon, kettle half full, boiled.
My kettle is badly scaled. Now what?
Repeat the descale. Cuisinart: “Repeat this with cooled vinegar until all deposits are removed.”
Does this work for a stovetop kettle?
This guide follows electric kettle manuals. For stovetop kettles, follow your maker's care page; our kettle guide covers both types.
Keep reading
About this guide: Written by Sara Ibrahim. We did not test these products. Manuals were read from the copies attached to the makers' Amazon listings. Cupindy is not affiliated with any brand named here. Sources:
- OXO Clarity Adjustable Temperature Kettle manual
- Cuisinart PerfecTemp CPK-17 booklet
- Breville Soft Top Pure BKE700 instruction book
- Smeg KLF03 kettle manual
- Hamilton Beach 1.7 L kettle use and care
- Fellow: Is Descaling Necessary? How Often to Descale a Kettle
- KitchenAid: How to clean an electric kettle
- USGS: Hardness of Water
- Urnex: OXO Descaling Solution ingredient sheet
- America's Test Kitchen: The Best Way to Clean an Electric Tea Kettle
- Essential Values, OXO and Cosori listing wording on Amazon, checked October 11, 2026.
