Citric acid in the washing machine: how to soften hard water and reduce limescale

In areas where hard water is common, a high mineral content can leave clothes feeling rougher, encourage residue build-up inside the washing machine, and make detergent less effective. Citric acid-an ingredient widely used for household cleaning-has been highlighted as an option that can help limit these effects when used properly. As well as helping to tackle limescale build-up, it can support washing machine upkeep and improve wash performance.

How does citric acid help to soften hard water?

Hard water contains higher levels of calcium and magnesium-minerals that can settle both on fabric fibres and on the internal parts of a washing machine. Citric acid reacts with these minerals, which helps reduce scale deposits and allows detergent to work better 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 where water hardness is high.

How to use citric acid in a washing machine?

Citric acid can be used both to clean the machine and as a helper in certain washes, as long as you follow the appliance manufacturer’s guidance and avoid overuse.

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

• 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
• Avoid using more than the recommended amount
• Check your washing machine manual before applying it
• Repeat the clean-up only when necessary

What benefits can this habit bring?

Regular maintenance can help cut down mineral residue build-up, support the machine’s operation, and contribute to a more efficient wash. In hard water areas, it may also help reduce marks on clothing caused by limescale deposits.

That said, experts point out that citric acid does not replace dedicated laundry products, nor does it solve every issue linked to hard water. It should be treated as an add-on to washing machine maintenance.

• Helps reduce limescale build-up
• Supports detergent performance
• Can contribute to softer-feeling clothes
• Helps clean the machine drum
• Reduces internal mineral residue
• Complements preventative washing machine maintenance

What precautions matter before using this trick?

Before using any product in your washing machine, it is worth checking the manufacturer’s manual to see whether there are specific recommendations 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 trigger unwanted reactions. Use only the recommended amount and store the product in a dry place.

Simple maintenance to extend the washing machine’s lifespan

If your local water contains a lot of minerals, occasional cleaning with citric acid can help reduce limescale build-up and support the machine’s performance over time.

By combining this step with routine cleaning of the filter, detergent drawer, and door seals, you help keep the washing machine in good condition and maintain the quality of your washes.