Limescale builds up inside every washing machine in a hard water area, and vinegar or citric acid clears it out without a single plastic bottle of shop-bought descaler.
TL;DR
Descale a washing machine naturally by running an empty hot cycle (60°C or above) with 1-2 cups of white vinegar or 100g of citric acid poured into the drum, then a second rinse cycle to clear residue. Do this every 4-6 weeks in hard water areas across the UK, more often if your machine is 5+ years old. Verdict: citric acid wins over vinegar for descaling in 2026 — it's stronger on limescale, doesn't leave a smell, and pairs well with a plastic-free laundry routine using something like Regn's ecoegg detox tablets between deep cleans.
Why this matters
Limescale doesn't just clog kettles. It sits inside the heating element, the drum seal, and the pipework of your washing machine, and it's the single biggest reason machines stop heating properly or start smelling musty.
Hard water covers roughly 60% of England, concentrated across London, the South East, and the East Midlands. If you live in one of those postcodes, your machine is working against mineral buildup every single wash in 2026, whether you notice it or not.
Commercial descalers work, but most come in single-use plastic bottles packed with synthetic fragrance. Vinegar and citric acid do the same job for a fraction of the cost and none of the packaging waste — which is the whole point of a plastic-free laundry cabinet.
What you'll need
- White vinegar (distilled, not the flavoured kind) or 100g citric acid powder
- An old cloth or toothbrush for the seal and drawer
- A microfibre or bamboo cloth for wiping down the drum after
- Optional: a plastic-free laundry system such as Regn's ecoegg laundry egg washing system for your regular washes, since fewer synthetic detergent residues mean less buildup between descales
- 60-90 minutes, most of it unattended
The steps
1. Check your drawer and seals first
Pull out the detergent drawer and check for a grey, crusty residue — that's limescale mixed with detergent scum, and it's the first visible sign your machine needs descaling. Soak the drawer in a bowl of warm water and vinegar (50/50) for 20 minutes while you prep the machine. Skipping this step means the drawer keeps re-contaminating the drum after you've cleaned it.
Common mistake: people descale the drum but ignore the drawer, then wonder why the musty smell comes back within a week.
2. Empty the drum completely
Remove all clothes, coins, and stray socks before starting — an empty drum is non-negotiable for a proper descale cycle. Running a hot wash with fabric inside just redeposits loosened limescale onto your clothes instead of flushing it down the drain.
3. Add vinegar or citric acid directly to the drum
Pour 2 cups (500ml) of white vinegar straight into the drum, or dissolve 100g of citric acid in a jug of warm water first and pour that in. Citric acid is the stronger of the two against calcium carbonate deposits, which is why it's the better pick for genuinely hard water postcodes. Vinegar is gentler and fine for maintenance washes every 4-6 weeks.
4. Run the hottest, longest cycle your machine has
Select a 60°C (or 90°C if available) cycle with the longest duration setting — this is what actually melts limescale off the heating element rather than just rinsing the surface. A quick 30-minute cycle at 30°C will do almost nothing here; heat and time are what dissolve the mineral deposits.
Expected outcome: you'll often see grey or white flaky residue in the drum or filter after this cycle. That's limescale leaving the machine, not a problem.
5. Wipe the door seal and glass by hand
While the machine finishes, dip a cloth in the leftover vinegar-water mix and wipe down the rubber door seal, where mould and limescale hide together in the folds. A toothbrush gets into the seal grooves that a cloth can't reach. This is the single most-skipped step, and the reason machines that get "descaled" still smell.
6. Clean the filter
Most front-loaders have a small drain filter behind a flap near the bottom front. Open it over a shallow tray (expect some water), unscrew the filter, and rinse off any limescale flakes or debris under a tap. A blocked filter after a descale cycle is normal — that's exactly what it's designed to catch.
7. Run one final empty rinse cycle
Run a short, cool cycle with nothing added to flush out any remaining vinegar smell or citric acid residue. Skipping this step is the most common reason people report their next load of towels smelling faintly of vinegar.
Troubleshooting
The machine still smells musty after descaling. You've likely missed the door seal or the drawer — go back and hand-clean both with a vinegar-soaked cloth, focusing on the seal folds.
Grey flakes keep appearing in every wash. This is leftover limescale working its way out over several cycles, not a new problem. Run one more empty hot cycle with citric acid and it should clear within 2-3 washes.
Clothes come out with a slight vinegar smell. You skipped or shortened the final rinse cycle. Always run a second, empty cycle after any descale wash.
The machine won't heat properly even after descaling. Heavy limescale can permanently damage the heating element over years of neglect. If descaling doesn't restore heating within 2-3 attempts, the element itself may need replacing by an engineer.
Citric acid isn't dissolving fully. Always dissolve it in warm water first — tipping the powder straight into the drum leaves undissolved grit that won't clean anything.
The rubber seal still looks black in the folds. That's likely mould rather than limescale. Vinegar helps, but for stubborn mould you may need to repeat the hand-clean step 2-3 times over a week.
Tools and resources
- White vinegar or citric acid powder (either from a supermarket or a refill shop)
- An old toothbrush for seals and drawer grooves
- Regn's natural laundry detergent sheets for your regular washes, which dissolve fully and leave less residue behind than bulky liquid detergents
- A microfibre or bamboo cloth for the final wipe-down
- Your machine's manual, to confirm the hottest cycle setting available on your model
What to do next
Once your machine is descaled, the goal is stretching the gap between deep cleans. Best enzyme washing machine cleaners for eco-laundry breaks down which plastic-free maintenance products actually extend the interval, and whether enzyme tablets or citric acid do a better job long-term.
FAQ
What's the best natural way to descale a washing machine? Citric acid dissolved in warm water, run through a 60°C or 90°C empty cycle, is the strongest natural option against hard water limescale. Vinegar works too but is gentler and better suited to maintenance washes every 4-6 weeks.
Is vinegar or citric acid better for descaling? Citric acid outperforms vinegar on heavy limescale because it binds more effectively to calcium carbonate deposits. Vinegar is cheaper and fine for softer water areas or lighter maintenance.
How often should you descale a washing machine naturally? Every 4-6 weeks in a hard water area, or every 2-3 months in a soft water area. Machines over 5 years old in hard water postcodes often need it monthly.
Does descaling a washing machine actually save money? Yes — limescale on the heating element forces the machine to use more energy to reach the same temperature, and Energy Saving Trust data has flagged descaling as a way to protect appliance efficiency in hard water regions.
Can you use bicarbonate of soda instead of vinegar? Bicarbonate of soda is better for odour absorption than limescale removal. Use vinegar or citric acid for descaling and save bicarb for a general deodorising wash.
Will descaling fix a washing machine that won't heat? Sometimes — if the issue is limescale coating the element, descaling restores heating within 2-3 cycles. If it doesn't, the element may need professional replacement.
How much citric acid do you need per wash? Around 100g dissolved in warm water for a standard-size drum, poured directly in before an empty hot cycle.
Is it safe to descale every wash? No — descaling every single wash is unnecessary and can dry out rubber seals over time. Stick to a 4-6 week schedule in hard water areas.
One last thing
Most people descale the drum and forget the drawer, which is exactly where limescale and detergent scum team up to cause the smell everyone blames on the machine itself. Soak the drawer separately every time, and pair your descale routine with plastic-free detergent sheets so there's less synthetic residue for limescale to cling to in the first place — small swap, noticeably longer gap between deep cleans by the time you're doing this again later in 2026.
