What limescale actually is
Limescale is the chalky deposit left behind when hard water evaporates. Hard water contains dissolved calcium and magnesium, and as it dries on taps, glass and ceramics, those minerals stay behind. Heat speeds it up, which is why kettles, shower heads and the area around taps are the worst affected.
Your water company's website will tell you how hard your water is by postcode. Broadly speaking, London, the South East, East Anglia and parts of the Midlands have hard water, while Scotland, Wales, Northern Ireland, the North West, the North East and Devon and Cornwall generally have softer water – though there are plenty of local exceptions.
The basic method: mild acid and time
Limescale dissolves in mild acid. White vinegar, lemon juice and citric acid (sold in powder form in supermarkets and hardware shops) all work, as do dedicated limescale removers. The trick is contact time: soak a cloth or paper towel, wrap it around the affected area and leave it for 30 minutes to an hour, then rinse and wipe.
Always rinse surfaces thoroughly with clean water afterwards, and dry them to stop new marks forming straight away.
Surfaces that need extra care
Acid that dissolves limescale can also damage some materials. Avoid acidic products, or check the manufacturer's advice first, on:
- Natural stone such as marble, limestone and travertine – acid etches the surface
- Some brass, gold-effect and specialist tap finishes
- Cement-based grout, if used repeatedly
- Enamel baths, particularly older ones, with prolonged contact
Room by room
The same principle – mild acid, enough time, then a thorough rinse – works everywhere, but each spot has its own quirks.
Taps
Wrap a vinegar-soaked cloth around the base and spout and leave it for half an hour. An old toothbrush helps around the joins. Unscrew the aerator at the end of the spout if you can and soak it in a small bowl of vinegar.
Shower heads
If the shower head unscrews, soak it in a bowl of vinegar or citric acid solution for an hour, then scrub the nozzles with a soft brush. If it's fixed, fill a sandwich bag with the solution, tie it around the head and leave it. Many heads have rubber nozzles you can rub with a finger to dislodge scale.
Shower screens
Spray with a diluted vinegar solution or limescale remover, leave for a few minutes, then wipe with a non-scratch sponge and rinse. Squeegee after every shower to stop it building up again – it's the single best habit for clear glass.
Toilets
Limescale rings below the waterline are easiest to reach if you lower the water level first. A dedicated toilet limescale remover left for the recommended time, followed by a brush, usually works. Don't combine it with bleach-based toilet cleaners.
Kettles
Half-fill with equal parts water and white vinegar, or use a sachet of citric acid descaler, bring to the boil and leave for an hour. Empty, then boil and discard clean water a couple of times to remove any taste.
Get quotes from local cleaners
Stopping it coming back
You can't stop hard water drying on surfaces, but you can stop it building up. Squeegee or wipe shower glass and taps dry after use. A quick weekly descale is far easier than a twice-yearly battle. Water softeners fitted to the mains supply reduce limescale throughout the home, though they're a bigger investment and you'll want specialist advice.
How to tell limescale from soap scum
They often appear together in bathrooms, but they're different. Limescale is hard, chalky and white or cream-coloured, and doesn't come off with ordinary washing-up liquid. Soap scum is softer, greyish and slightly greasy, formed when soap reacts with minerals in the water.
Soap scum responds better to warm water, washing-up liquid and a non-scratch sponge. Limescale needs a mild acid. On shower screens you often need both: remove the soap scum first, then the scale underneath.
Common mistakes
Most limescale problems come down to a few habits:
- Not leaving the product long enough – scale dissolves slowly
- Using abrasive pads on chrome or glass, which leaves permanent scratches
- Forgetting to rinse, which can leave marks or damage finishes
- Using acidic products on natural stone, enamel or specialist tap finishes
- Mixing limescale removers with bleach or other cleaners
When to get professional help
Thick, years-old limescale on glass and tiles can take hours to remove by hand, and some damage – etched glass in particular – is permanent. Bathroom descaling is a standard part of a deep clean, and cleaners in hard water areas deal with it all the time. Mention how bad it is when you ask for quotes so they can allow enough time.
