How Citric Acid Helps With Hard Water in the Washing Machine

In areas with hard water, excess minerals can leave clothes feeling rougher, encourage residue to build up inside the washing machine and make detergent less effective. Citric acid, an ingredient widely used for household cleaning, is increasingly cited as an option that may help limit these effects when used properly. As well as helping to tackle limescale build-up, it can support washing machine maintenance and improve washing efficiency.

How does citric acid help to soften water?

Hard water has higher levels of calcium and magnesium, minerals that can settle on fabric fibres and within the washing machine’s internal components. Citric acid reacts with these minerals, helping to limit scale formation and allowing detergent to work more effectively during the wash.

While it is not a replacement for a water-treatment system, this ingredient can be used from time to time to reduce limescale accumulation in the washing machine, particularly in places with very hard water.

How should citric acid be used in the washing machine?

Citric acid may be used both to clean the machine and as an aid in certain washes, provided that the appliance manufacturer’s instructions are followed and excessive amounts are avoided.

For washing machine maintenance, it is usually dissolved in water and run through an empty wash cycle, allowing the solution to circulate through the drum and internal parts.

• Use citric acid intended for household use
• Dissolve the product according to the instructions on the packaging
• Run a cleaning cycle with the machine empty
• Do not use more than the recommended amount
• Check your washing machine manual before applying it
• Repeat the cleaning process only when needed

What benefits can this habit offer?

Regular maintenance may help minimise the build-up of mineral residues, supporting the machine’s operation and contributing to more efficient washing. In hard-water areas, it may also reduce marks on clothes caused by limescale deposits.

However, experts point out that citric acid does not replace products designed specifically for washing clothes, nor does it solve every issue linked to water hardness. It should be regarded as an additional part of washing machine maintenance.

• Helps reduce limescale build-up
• Supports the action of detergent
• May help clothes feel softer
• Assists with cleaning the machine drum
• Reduces internal mineral residues
• Complements preventive washing machine maintenance

What precautions are important before using this method?

Before putting any product in the washing machine, check the manufacturer’s manual for specific advice on cleaning and descaling. Some models already include dedicated maintenance programmes.

It is also essential never to mix citric acid with bleach or other incompatible chemicals, as this can cause unwanted reactions. Use only the recommended quantity and store the product in a dry place.

Carry out simple maintenance to extend the washing machine’s lifespan

If the water in your area contains high levels of minerals, periodic cleaning with citric acid can help reduce limescale build-up and support the machine’s performance over time.

Combined with regular cleaning of the filter, detergent drawer and door seals, this care helps keep the washing machine in good condition and preserve the quality of each wash.