How to Descale a Kettle (Remove Limescale Fast)

Psst… There’s something brewing inside of your kettle, and it’s not your usual cup of tea. It’s limescale.

It’s inevitable that limescale will gradually build up in a kettle and unfortunately, sometimes it can be unsightly. Don’t be fooled by its underwhelming appearance; limescale build-up can actually damage your kettle or even cause your stove element to burn out!

But wait a minute- if it’s bad for our kitchen appliances, does that mean it is also bad for our health?

Before we get too far ahead of ourselves, let’s take a couple steps back and find out exactly what limescale is, how it forms, if it is at all dangerous and how to remove it from your kettle? Plus if you stick around ‘til the end, we might even spill some secrets about its dirty cousin; soap scum.

How to Descale a Kettle: Quick Answer

Fill your kettle just below the max line with a 50/50 mix of white vinegar and water, boil it, then let it sit for an hour before rinsing thoroughly. This is the simplest and most effective way to descale a kettle at home, no special products required. Full method and tips below.

What is Limescale?

Limescale is a stubborn, crusty and off-white chalky substance that is found in kettles or other water-operated machinery or equipment that involves heat transfer elements.

Over time, the build-up of limescale acts like an insulator and slows down the amount of heat that is produced, therefore the kettle takes longer to boil. This impairment can cause damage to your kettle or even to the heating element inside the kettle or on which it rests.

How does Limescale Build-Up Occur?

Also known as calcium scale, limescale occurs in kettles when hard water (water containing a high concentration of naturally occurring minerals, particularly calcium and magnesium) is heated or boiled. When the water evaporates, it leaves behind calcium carbonate deposits that form a layer of scale across the surface, creating that chalky substance you may have seen on the metallic insides of your kettle.

Kettles aside, hard water also manifests itself as a crusty white film around your faucets, showerhead or bathtub. In these cases, it may leave behind a soap scum build-up, create a lacklustre appearance or even cause peeling around these bathroom fittings.

Is Limescale Harmful?

Short answer: no, limescale itself isn’t considered harmful to your health. While the thought of consuming a chalky substance that’s been stuck to the bottom of your kettle is anything but appetising, there is no actual evidence that doing so is harmful to your health. In fact, some even argue that its high concentrations of calcium and magnesium can even contribute to our dietary needs, particularly if we are consuming it on a regular basis, although this too is unproven.

The real harm lies in what it can do to your kettle, your stove and your electricity bill! The more that limescale builds up, the more of a risk you run impairing your kettle and the longer you’ll have to wait for that cup of tea.

So to keep your water boiling quickly, try this method for removing limescale as soon as you start to notice a build-up.

How to Remove Limescale from a Kettle

This same descaling method works whether you’d describe the build-up as limescale, calcium buildup, or just “that white crusty stuff” in your kettle, it’s all the same thing.

Before you begin, you will need:

• White vinegar (you may substitute this with lemon juice if necessary)
• Dishwashing detergent
• Wash Cloth
• Microfiber cloth or soft towel
• Olive oil or baby oil

Method:

1. Fill your kettle to just below the maximum level with 50/50 white vinegar (or lemon juice) and water
2. Boil the kettle
3. Let this stand for one hour
4. Rinse the kettle thoroughly
5. Wash the kettle with water and detergent
6. Dry off with microfiber or soft towel

If your kettle is stainless steel, buff with a light coating of either olive oil or baby oil afterwards.

Using Baking Soda as an Alternative

If you don’t have vinegar or lemon juice on hand, bicarb soda (baking soda) is a common alternative. Mix two to three tablespoons of bicarb soda with water to fill the kettle to a similar level, boil, then let it sit for 15 to 20 minutes before rinsing thoroughly and boiling a full kettle of plain water once or twice more to clear any residue and taste. It’s gentler than vinegar but generally works best on lighter buildup rather than heavily scaled kettles.

Consistency is Key

It’s important to repeat this method every couple of months to prevent limescale from damaging your kettle over time. The more often you do it, the less time it will require to remove the limescale. On the other hand, if the limescale is severe or if it happens to be particularly stubborn, try increasing the amount of vinegar and leaving the mixture in your kettle overnight. Alternatively, you can just repeat the method a couple of times until all of the limescale is gone.

Now we may have you wondering, what about those faucets and showerheads? Sure enough, the same method should work for those as well with a slight twist (see our full shower cleaning guide for more):

Try soaking a towel in the mixture of vinegar and water and wrap it around the affected area. Secure it tightly with a clasp or rubber band and leave it for an hour. You’ll be back to having a shiny, soap scum free bathroom in no time!

Do you have any suggestions or questions about removing limescale? Let us know or visit our website for more cleaning information. If kitchen appliance upkeep like this tends to fall through the cracks, our regular cleaning service and one-off cleans can take it off your plate, see our house cleaning checklist for how tasks like this fit into a broader routine.

Frequently asked questions

How do you descale a kettle naturally?

White vinegar and water is the most common natural method, fill the kettle with a 50/50 mix, boil, let it sit for an hour, then rinse thoroughly. Lemon juice works as a substitute for vinegar, and bicarb soda is a gentler natural option for lighter buildup.

How often should you descale a kettle?

Every couple of months is a good general guide, more often if you’re in a hard water area, which you’ll usually notice from faster limescale buildup or a chalky film appearing sooner after each descale. Regular descaling also means each clean takes less time, since the buildup never gets a chance to become severe.

Is limescale in a kettle dangerous to drink?

No, there’s no evidence that limescale is harmful to drink. It’s unappetising and can affect the taste of your tea or coffee, but the real damage is to your kettle itself, since a heavy build-up acts as an insulator, makes it take longer to boil, and can eventually damage the heating element.

Can I use bicarb soda instead of vinegar to descale a kettle?

Yes, bicarb soda is a good alternative if you don’t have vinegar on hand, particularly for lighter buildup. For more stubborn, heavily scaled kettles, white vinegar or lemon juice tends to be more effective.