Limescale on Taps and Showerheads: How to Clear It Safely

White crust round the tap spout, a showerhead that sprays sideways, or a kettle that rattles with scale? That’s limescale, and in hard-water areas like Clare, Sudbury and the Suffolk–Essex border it builds up quickly. Anglian Water explains that the natural minerals the water picks up in our region, such as calcium and magnesium, slowly settle as scale on taps and in kettles. The good news: on most taps and showerheads you can clear it safely yourself with a mild acid such as lemon juice or white vinegar, a soft cloth and a little patience. Here’s how, and when it’s time to call a plumber instead.

Before you start: three quick safety checks

• Check the finish. Look at the tap or shower maker’s care guide first. Some brushed, coloured, gold-effect or natural-stone finishes can be marked by acidic cleaners, even vinegar. If the guide says water and a soft cloth only, stick to that.
• Read the label on any shop-bought descaler. Wear gloves, keep the room ventilated, and never mix a descaler with bleach or other cleaning products: mixing chemicals can give off harmful fumes.
• Leave electric showers sealed. On an electric shower you may unscrew the showerhead and hose by hand, as the shower manual describes. Never open the shower unit itself, and switch the shower off at its pull cord or isolator before you start. Keep water away from the unit, switches and sockets.

How to descale a showerhead

1. Switch the shower off. For an electric shower, turn it off at the isolator or pull cord too.
2. Unscrew the head by hand. Most heads twist off the hose. Don’t use grips on chrome; if it won’t budge, leave it on and use the bag method in step 4.
3. Rub the nozzles. Many modern heads have soft rubber nozzles. Rub them with your thumb and a lot of scale simply flakes off.
4. Soak it. Put the head in a bowl of equal parts white vinegar and warm (not boiling) water for about an hour. If it won’t come off, fill a plastic food bag with the mix, slip it over the head and hold it with a rubber band.
5. Brush and rinse. Use an old soft toothbrush on the face, then rinse thoroughly in clean water.
6. Refit and test. Screw it back on hand-tight, check the washer is seated, then run the shower for a minute. Look for drips at the hose joint.

How to clear limescale from taps

1. Use Anglian Water’s lemon trick. Cut a lemon in half and push it onto the end of the spout so the juice sits on the scale. Leave it for a while, then wipe the tap clean, as Anglian Water suggests.
2. Wrap stubborn spots. Soak a cloth or kitchen roll in white vinegar, wrap it around the base of the tap or the spout and leave it for 30 to 60 minutes.
3. Clean the aerator if it unscrews by hand. Many spouts have a small mesh insert at the tip. If yours twists off by hand, soak it in the vinegar mix, brush it, rinse and refit. Put the plug in first so small parts can’t drop down the plughole.
4. Rinse and dry. Wipe everything with clean water, then dry it. Drying after use is the easiest way to slow new scale.

Kettles and keeping scale away

For the kettle, Anglian Water suggests boiling it with lemon segments (or a little vinegar) in the water, letting it cool, then rinsing well before you use it again. To slow build-up on taps and showers, wipe them dry after use, clean little and often rather than once a year, and rub the showerhead nozzles every week or two.

Thinking about a water softener?

A softener can cut scale, but it’s a plumbing job. It has to be connected so you still have an unsoftened tap for drinking and cooking. Anglian Water says a plumber can check your softener is working properly and that you have a non-softened tap available. It also needs to meet the Water Supply (Water Fittings) Regulations 1999, so it’s not a DIY fit. If an existing softener starts giving salty-tasting water or tiny bead-like bits, stop drinking from that tap and have it checked.

What not to do

• Don’t chip scale off with knives, wire wool or scourers: you’ll scratch the finish and can damage seals.
• Don’t force a stiff tap handle or take a tap apart to get at hidden scale.
• Don’t try to descale a boiler, hot-water cylinder or immersion heater yourself. Scale inside a combi boiler’s heat exchanger is a job for a Gas Safe registered engineer, usually spotted at a service. Never remove a boiler casing.
• Don’t use boiling water on plastic showerheads or hoses.

When to stop and call us

• A tap still drips or won’t turn off fully after cleaning. See our dripping tap guide, then call us for a washer or cartridge repair.
• The shower is still weak after descaling. It may not be scale at all: work through our low water pressure checks.
• The showerhead or hose joint leaks, or a fitting is seized and won’t come off by hand.
• Your combi boiler is slow to give hot water, kettling (rumbling) or showing a fault. Book a Gas Safe engineer rather than tackling it yourself.
• You’d like a water softener, new taps or a new shower fitted properly.

Our plumbing team handles taps, showers and softener connections, our bathroom installation team can replace worn-out fittings, and our boiler servicing engineers can check a scaled-up combi.

If a leak starts

If a fitting starts leaking while you’re cleaning, turn off the inside stopcock first. Here’s how to find and turn off your stopcock; don’t force it if it’s stiff. The outside or boundary stop tap is usually owned by the water company (Anglian Water or Essex & Suffolk Water), may need a special key and can serve neighbours too, so don’t dig it up or force it. Contact the water company about a leak on their side, and check whether neighbours are affected. If water reaches sockets or lights, keep clear. A tripped RCD or MCB may be reset once from a dry spot with dry hands; if it trips again, leave it off and call a registered (Part P) electrician. Never touch electrics near water.

Smell gas or suspect carbon monoxide? Leave the property, open doors and windows if it’s safe, don’t use light switches or naked flames, turn the gas off at the meter only if it’s safe to do so, and call the National Gas Emergency Service on 0800 111 999. Get medical advice if anyone has CO symptoms such as headaches, dizziness or nausea. Only a Gas Safe registered engineer may work on gas appliances; you can check an engineer on the Gas Safe Register.

Sources and further reading

• Anglian Water: hard water
• Anglian Water: top tips for hard water
• Anglian Water: water softeners
• Your tap, shower and descaler manufacturers’ care instructions

This is general safety guidance. If you’re unsure, stop and call a qualified engineer.