How to remove limescale from taps without damaging the finish

That whitish film that appears around the aerator, at the base of the single-lever mixer or in the corners of the shower tray is not dirt: it is limescale. And the problem is not that it is difficult to remove, but that most people attack it with the first thing they have at hand, and that is where a beautiful tap remains matt, scratched or with its colour eaten away forever. Chrome lasts a long time; A matt black, a PVD gold or a coloured lacquer does not forgive a single mistake. In this guide we explain what limescale is, how to know the hardness of the water that reaches your home, what product you can use in each finish and what is the step-by-step method that does not compromise either the shine or the guarantee.

What is limescale and why does it appear?

The water that reaches your house is not pure water: it has dissolved mineral salts that it has collected as it passes through the land, mainly calcium carbonate and, to a lesser extent, magnesium salts. While the water is liquid, these minerals travel dissolved and are invisible. The problem begins when the water evaporates: the mineral does not evaporate with it, it stays on the surface. Each drop that dries leaves a micro deposit. Repeat this gesture several times a day for weeks and the result is that white, rough and opaque scab that you no longer rub your hand over.

That is why limescale is seen earlier in taps and shower enclosures than in any other part of the house. They are the two surfaces in the bathroom that receive water daily, that are polished or transparent—where any film is immediately noticeable—and that almost no one dries. In the basin, an extra factor is added: the jet splashes microdroplets towards the spout and the base of the single-lever mixer, which remain there until they dry. And the same thing happens inside the aerator, where you don't see it, until one day the jet opens into a fan or loses strength.

There is a second factor that accelerates everything: temperature. Hot water encourages carbonate to precipitate sooner, so the shower taps, hot water side, and shower enclosure of a steamy bathroom build up limescale faster than a basin tap that is only used with cold water. It's not that you have worse water in the shower, it's that the conditions help the mineral to deposit.

Water hardness in French degrees

The amount of these dissolved salts is what we call water hardness. In Spain, the unit usually used is the French degree, which is written ºfH and is equivalent to 10 milligrams of calcium carbonate per litre. The higher the number, the more mineral the water carries and the sooner you will see limescale in the taps. It is a very practical piece of information: it tells you if you are going to need to dry the tap daily or if monthly cleaning is enough.

The indicative scale used as a general reference distributes the water into four sections. Up to about 15 ºfH it is considered soft water: it barely leaves a mark and the limescale takes a long time to become visible. Between 15 and 30 ºfH we speak of medium hardness, the most common range, in which the limescale appears but is controlled effortlessly. Between 30 and 40 ºfH the water is hard and the difference is noticeable immediately: the deposits are visible after a few days and a constant routine is necessary. Above 40ºfH we are in very hard water, where drying after each use stops being advice and becomes the only thing that keeps a presentable tap.

These sections are a general reference, not a diagnosis of your home. The real and updated data on your address is published by the water supply company of your municipality, normally on its website within the water quality report, and may vary from one neighborhood to another within the same municipal area depending on the catchment from which the network is supplied at any given time. Before deciding if a descaler is worth it or if a drying routine is enough, check this information: it is free and the only reliable one.

What to use and avoid for each finish

Here are ninety percent of the disasters. All taps seem equally resistant, but beneath the colour there are very different technologies and each one tolerates different things. Before bringing anything close to the tap, identify its finish.

Chrome is the most appreciated: a hard and quite tolerant metallic layer, which accepts diluted vinegar and mild pH anti-limescale without problem. Even so it is not indestructible. Abrasives microscratch it and, over time, those microscratches blur the reflection until the tap loses that mirror effect that made it attractive. It degrades little by little, without a specific day when it goes bad, which is precisely what makes no one associate the result with the scouring pad that they have been using for months.

PVD (physical vapour deposition) is the system with which current gold, copper, brushed gold and gun metal are achieved. It is a very thin and very hard layer, resistant to scratching, but chemically sensitive: a strong acid or an aggressive decalcifier can alter the tone permanently and without possible repair. With PVD, warm water, neutral soap and drying; the anti-limescale only if it has a soft pH and with very brief contact.

The brushed stainless steel has a directional texture that is part of the design. Always clean following the direction of brushing, never in circles, and forget about the metal scouring pad: it would leave crossed marks that are impossible to hide, because the eye instantly detects any stroke that does not follow the original direction.

Matt black and coloured lacquers are the most delicate of all. They are layers of technical paint and their enemy is not only acid: they are also solvents, cleaning alcohol and any abrasive powder, which leave shiny areas on the matt that cannot be recovered. Neutral soap, warm water, soft cloth and dry. Nothing else.

The gold and copper finishes deserve a separate paragraph because they are the ones that cause the most discomfort. Its attractiveness depends entirely on a surface layer of a few microns, and a limescale stain on gold is much more visible than on chrome, so the temptation to insist on product is enormous. It is precisely there where the tone is lost: dull areas or areas with a different reflection appear that do not match in any way. With gold and copper the norm is to intervene early and with little. If the stain persists, repeat the gentle cycle another day before increasing the aggressiveness of the product.

A step-by-step cleaning method

This is the procedure that works for practically any tap, adjusting the product to the finish according to the previous table. Set aside ten minutes and do it without rushing: most messes come from wanting to solve something that needs two gentle passes in two minutes.

1. There is no need to turn off the water. You are not going to disassemble anything from the internal circuit, so you can work with the installation in service. You will only turn off the tap if you decide to disassemble the aerator and prefer to avoid splashes.
2. Apply the product on the cloth, never directly on the tap. Spraying on the taps causes the liquid to seep through joints, threads and the base of the single-lever mixer, right where you cannot rinse it well later. Soak up a microfibre or soft cloth and work from there.
3. Short contact time. A few minutes is enough to soften the tank. If the scab is thick, it is much better to repeat the cycle twice than to leave the product on for half an hour.
4. Do not let the product dry on it. An evaporated anti-limescale concentrates its acidity on the finish, and that is where irreversible stains appear. If you see that it is drying, wet the cloth again and continue.
5. Rinse with plenty of water. It is not enough to wipe with a damp cloth: you have to drag the remains of the product from the entire piece, including the base and the area behind the spout, which is where they usually get trapped.
6. Dry with microfibre. This step is neither optional nor aesthetic: if you leave the tap wet after cleaning it, in a few hours you will have a new layer of limescale on top of the work you just did.
7. Pay attention to joints and edges. The rubber, silicone gaskets and joint areas between the tap and the countertop degrade with acidic products. Go through it with soap and water only, and dry them well.

The aerator: the component most prone to blockage

The aerator is that threaded piece at the tip of the spout that mixes air with water to give a soft stream and consume less. As it is the last point through which the water passes, it is where limescale residues and particles dragged by the network end up accumulating. When the jet fans out, deflects to one side, or loses power, the aerator is almost always the culprit, not the installation.

To clean it, unscrew the piece by hand; If it is stuck, place a cloth or tape between the tool and the metal to avoid marking the finish. Disassemble it carefully and look at the exact order of the pieces before separating them, because the filter, mesh and housing have a specific position and assembling them upside down changes the jet. Let them soak in white vinegar diluted in water for a while, then brush with a soft bristle brush or an old toothbrush, and rinse thoroughly under the tap to remove any loose debris. Never force the holes with a pin or a punch: you deform the mesh and you will no longer recover the original jet.

Before reassembling it, open the tap for a few seconds without the aerator to expel whatever has dislodged into the spout. And keep in mind that a good part of the current taps have integrated aerators, recessed and without a surface to grip: these are disassembled with a specific key that usually comes in the product box. Keep it along with the documentation, because without it there is no convenient way to get it out.

Cleaning the shower enclosure

In glass the limescale behaves the same, but you can see much more. The key distinction here is whether your shower enclosure has a water-repellent treatment or not. This treatment is an anti-limescale layer applied to the glass that reduces the adhesion of water: the drops slide off instead of staying, and therefore less mineral is deposited. It is not eternal nor does it free you from drying, but it greatly lengthens the intervals between thorough cleanings.

With or without treatment, the routine that really works is the same: pass the rubber squeegee across the glass after each shower, from top to bottom, and finish the profiles and bottom with a microfibre. Thirty seconds. If you instead let the water dry on its own, with hard water you will have white veil in a matter of days.

What is strictly prohibited is the scouring pad and any abrasive or cream cleaner. In treated glass, these products literally tear off the water-repellent layer, and from there the shower enclosure becomes dirtier than one that was never treated, with no possibility of recovering it. Also keep an eye on the lacquered aluminium profiles: they are paint on metal, so they go with water and neutral soap, never with strong anti-limescale, and they must be dried, because the moisture retained in the lower guide is what ends up leaving marks. If you are in the process of choosing a shower enclosure and want to take this factor into account from the beginning, our guide on how to choose a shower enclosure according to measurements and types will help you.

Prevention: a routine that works

Removing limescale is a job; Preventing it from forming is a habit. This is enough:

• Dry the tap and shower enclosure with microfibre after use. It is eighty percent of the result.
• Ventilate the bathroom after showering so that ambient humidity does not prolong drying.
• Clean it weekly with warm water and neutral soap, without waiting to see the stain.
• Reserve the mild pH anti-limescale for when it is needed and always choose it according to the finish.
• Check the aerator every few months, before you notice a loss of flow.
• If your water is hard or very hard, consider a descaling treatment for the entire home: it is the only root solution.

When limescale is not the cause

There are three symptoms that many people try to solve by cleaning and that are not fixed with any product, because their origin is different. The first is a continuous drip that persists with the tap tightly closed: the culprit is usually the ceramic cartridge, a wear part that must be replaced, and continuing to squeeze the handle only worsens the internal seat.

The second is a flow rate that remains low after cleaning the aerator. There you have to look upstream: a flexible connector that is clogged or partially bent behind the furniture, or an isolation valve that is not fully open or that has a blocked filter. It is a two-minute check that saves changing a tap that was perfectly fine.

The third is the stains that no longer come out no matter how much you insist. Most likely it is not limescale, but the attacked finish: an area where the chrome, PVD or lacquer has been deteriorated by an aggressive product. There is no cleaning involved, just replacement of the part. If you have questions about which spare part corresponds to your model, write to us from our contact page and we will guide you.