Using soda crystals in your laundry routine can raise a valid concern: can soda crystals damage washing machine components? No, soda crystals do not damage your washing machine when used correctly.

They are a traditional, safe, and effective cleaning agent—especially for tackling limescale, soap scum, and odours.

However, improper use or excessive quantities may lead to build-up or residue in the system, especially in colder wash cycles or if not fully dissolved.

What are soda crystals in washing machine?

Soda crystals, also known as washing soda, are alkaline compounds (sodium carbonate) commonly used to soften water, dissolve grease, and deep clean appliances.

In the UK, they’re a staple in traditional cleaning routines and widely used as part of washing machine maintenance with soda crystals.

These crystals are an effective natural washing machine cleaner, helping homeowners avoid harsh chemical alternatives.

They’re not only budget-friendly but also eco-conscious, making them ideal for those wanting to maintain their appliances while reducing their environmental footprint.

How do soda crystals work inside your washing machine?

When dissolved in water, soda crystals react with minerals to soften hard water, which enhances detergent efficiency.

They also break down fatty residues and eliminate odours caused by soap scum and bacteria.

This action descales the washing machine, flushes out detergent build-up, and clears any blockages in the system.

Difference from baking soda:

• Soda crystals (washing soda): High pH (~11), powerful degreaser
• Baking soda: Mild pH (~8.5), deodorizer with gentle cleaning ability

Because of their potency, soda crystals should be used in moderation and with hot water to ensure full dissolution.

Can soda crystals damage washing machine components?

Generally, no. Soda crystals are safe for your machine’s drum, pipes, and seals. They’re non-corrosive and don’t erode materials when used properly.

But using too much too often or not running a hot enough cycle can leave undissolved particles, which may clog the system or affect efficiency.

Modern high-efficiency (HE) machines in the UK often have specific guidelines.

It’s best to consult your user manual or manufacturer’s recommendations before adding anything beyond detergent.

Where to put soda crystals in washing machine?

There are two main spots:

• Drum: Best for deep cleaning—add directly into an empty drum.
• Detergent drawer: Ideal for regular laundry—add a small scoop to boost detergent action and soften water.

For those dealing with a particularly bad build-up or odour, start with a full 500g in the drum followed by a hot wash.

This removes internal residue efficiently and refreshes your machine.

How much soda crystals should you use?

Purpose	Amount	Placement
Monthly deep clean	500g	Directly in drum
Softening laundry	25g per load	Detergent drawer
Odour removal	200g	Drum + hot cycle

These are approximate values. Always adjust based on your water hardness and washing machine capacity.

When and how often should you use soda crystals?

Depending on your needs, use soda crystals as follows:

• Once a month: Run an empty hot wash (60–90°C) with 500g soda crystals to maintain cleanliness
• Weekly (optional): Add 25g to detergent drawer to soften water and enhance detergent
• Occasionally: Use 200g in the drum when tackling strong odours or noticeable residue

Using soda crystals routinely can prevent build-up and reduce the need for professional cleaning or repairs.

What steps should I follow to clean my washing machine with soda crystals?

Here’s a quick step-by-step guide:

• Add ½ kilograms of soda crystals to the empty drum
• Make sure the machine is set to the hottest cycle (preferably 90°C)
• Run the wash without any laundry
• After the cycle, wipe the rubber door seal and inside the door
• Remain the door open to let it air dry & prevent mould

This process helps remove odours like rotten egg from the washing machine, eliminates grime, and keeps your appliance fresh.

Can using soda crystals improve laundry results and save money?

Yes! Here’s how:

• Softened water: Less detergent needed for effective cleaning
• Odour control: Keeps machine fresh, improving smell of laundry
• Improved efficiency: Takes of soap scum & limescale, enhancing spin performance

In the long term, you’ll use less detergent and experience fewer machine issues—translating to lower maintenance costs and better laundry outcomes.

What if it still smells or shows gunk after using soda crystals?

If odours or residues persist:

• Repeat the cleaning process
• Add 1 cup of white vinegar or citric acid during a second hot wash
• Clean the filter and door seals manually
• Check for hidden buildup behind the detergent drawer

These extra steps can resolve lingering issues, particularly in older machines or those that have never been deep-cleaned.

Are there risks of residue or rough clothes?

Yes, but only with incorrect use. Common mistakes include:

• Overusing soda crystals without sufficient water
• Running cold washes, which may not dissolve crystals fully
• Using in every wash, which can stiffen towels or leave residue on dark clothing

To avoid these problems, always follow dosage guidelines and dissolve crystals properly by running hot cycles.

In cases of extremely hard water, consider pairing soda crystals with a limescale remover or switching to STPP (sodium tripolyphosphate) occasionally.

Conclusion – Should I keep using soda crystals?

Yes—soda crystals are a safe, economical, and eco-friendly way to clean and maintain your washing machine, as long as they’re used properly.

With the right amount and frequency, they can prolong your machine’s life, reduce detergent usage, and improve your laundry results.

Just remember:

• Use hot water for deep cleans
• Follow the dosage for each use
• Clean seals and drawers occasionally by hand

By doing so, you’ll keep your machine in great condition and avoid the worry of whether can soda crystals damage washing machine parts.