You wash your sheets every week. But what about the thing underneath them?
Here's the uncomfortable truth: your mattress absorbs roughly 26 gallons of sweat per year. Add dead skin cells — about 1.5 million shed per hour while you sleep — and you've created an all-you-can-eat buffet for dust mites. A well-used mattress can harbour anywhere from 100,000 to 10 million of them, according to the Sleep Foundation.
The good news? Cleaning a mattress isn't complicated. It doesn't require special equipment. And it takes less than an hour of actual hands-on time. This guide walks you through the full process — stripping, vacuuming, stain treatment, deodorising, and the preventive steps that keep your mattress fresh between cleans.
What You'll Need Before You Start
Gather everything first so you're not hunting for supplies mid-clean. Most of this is already in your kitchen cupboard.
- Vacuum cleaner with an upholstery attachment
- Baking soda (bicarbonate of soda) — one full box for a double mattress
- Clean cloths or microfibre towels
- Cold water
- Washing-up liquid (a mild one)
- Hydrogen peroxide (3% solution) — for stubborn stains
- Enzyme cleaner — for organic stains like sweat, blood, or urine
One rule: never soak a mattress. Moisture trapped inside foam or springs leads to mould. Every method here uses minimal liquid, applied to the surface only.
How Do You Clean a Mattress Step by Step?
A thorough mattress clean follows six steps: strip, vacuum, spot-treat, deodorise, vacuum again, and air out. The whole process takes about 45 minutes of active work, plus waiting time for the baking soda to do its job. Here's exactly what to do.
Step 1: Strip All the Bedding
Pull off everything — sheets, duvet cover, mattress protector, pillowcases, the lot. (Not sure what counts as what? Our bedding terms glossary has you covered.) Throw it all in the washing machine on a hot cycle (60°C) to kill dust mites. If your pillows are machine-washable, now's a good time for those too.
Step 2: Vacuum the Entire Surface
Switch to the upholstery attachment on your vacuum. Work across the top in overlapping passes, then do the sides. Pay extra attention to seams, piping, and any tufted areas — that's where dead skin, hair, and dust collect most.
Don't rush this. A proper vacuum pass removes the surface-level debris that traps odours and feeds dust mites. Two slow passes are better than five fast ones.
Step 3: Spot-Treat Any Stains
Different stains need different approaches. Here's what actually works:
| Stain type | Solution | Method |
|---|---|---|
| Sweat / yellow rings | 1 tbsp washing-up liquid + 1 tbsp baking soda + 240 ml hydrogen peroxide (3%) | Apply with a cloth, blot gently, don't rub. Let sit 10 minutes, blot dry. |
| Blood | Cold water + enzyme cleaner | Always use cold water — hot water sets protein stains. Blot, apply enzyme cleaner, wait 15 minutes, blot dry. |
| Urine | Enzyme cleaner (undiluted) | Blot excess moisture first. Apply enzyme cleaner generously, let sit 15–20 minutes. Blot dry with a clean towel. |
| General spills | 1 tsp washing-up liquid + 240 ml warm water | Dampen a cloth with the solution, blot the stain, then blot with a dry cloth. Repeat until lifted. |
The golden rule with any mattress stain: blot, never scrub. Scrubbing pushes the stain deeper into the fabric and can damage the fibres.
Step 4: Deodorise with Baking Soda
This is the step that makes the biggest difference. Sprinkle a generous, even layer of baking soda across the entire mattress surface. Don't be shy — use the whole box for a double or king-sized mattress.
Baking soda is a natural odour neutraliser. It absorbs moisture and breaks down the acidic compounds in sweat that cause that stale smell. Leave it for at least 30 minutes. If you can leave it for a few hours — or even overnight — the results are noticeably better.
If your room gets direct sunlight, open the curtains. UV light is a natural antimicrobial, and the combination of baking soda and sun exposure is about as close to a professional-grade refresh as you can get at home.
Step 5: Vacuum Again
Vacuum up all the baking soda using the same upholstery attachment. Go slowly and thoroughly — any residue left behind can feel gritty under your sheets. Check the seams and edges twice.
Step 6: Air Out the Mattress
Before remaking the bed, give the mattress 30–60 minutes to breathe with the bedding off. Open a window if you can. This lets any remaining moisture from spot-cleaning evaporate completely.
How Often Should You Clean Your Mattress?
Twice a year is the minimum most sleep experts recommend — and it's a good baseline for most households. According to Consumer Reports, quarterly cleaning is worth considering if you don't use a mattress protector, if you have allergies, or if pets share the bed.
A practical approach: time it with the seasonal clock changes. When you adjust the clocks in spring and autumn, clean the mattress. It's an easy routine to remember, and it spaces the cleans roughly six months apart.
Between deep cleans, a quick vacuum every time you change the sheets keeps surface-level buildup in check. That alone makes a meaningful difference to dust mite populations and overall freshness.
How to Keep Your Mattress Cleaner for Longer
Cleaning is easier when there's less to clean. A few habits make a significant difference:
Use a mattress protector. This is the single most effective thing you can do. A good waterproof protector catches sweat, spills, and skin cells before they reach the mattress itself. It's machine-washable, so you clean the protector instead of the mattress. Look for one with a breathable membrane — the crinkly plastic ones from years ago are long gone.
Wash your bedding weekly. Sheets and pillowcases absorb the bulk of what your body produces overnight. Hot water (60°C) kills dust mites. If you're particular about your linens, check our guide on how to care for linen bedding — some fabrics prefer a gentler cycle.
Flip or rotate on a schedule. If your mattress is double-sided, flip it every three months. If it's single-sided (most modern mattresses are), rotate it 180 degrees so the head end becomes the foot end. This distributes wear evenly and prevents permanent body impressions.
Let it breathe in the morning. Pull the duvet back when you get up and leave it for 20–30 minutes before making the bed. This lets overnight moisture evaporate instead of getting trapped between the sheets and mattress.
What About Steam Cleaning?
A handheld steam cleaner can kill dust mites and bacteria on contact — the high temperature (usually above 100°C) is effective without chemicals. But there's a catch: steam adds moisture. On memory foam mattresses especially, trapped moisture can lead to mould inside the foam where you can't see it.
If you want to use steam, keep the nozzle moving (don't hold it in one spot) and allow extra drying time — at least 4–6 hours with good airflow before remaking the bed. For most people, the baking soda method above is simpler and safer.
While You're at It — Refresh Everything
A clean mattress deserves clean bedding. If you're going to the effort of a full mattress clean, it's a good moment to assess the rest of the bed. Are your pillows flat? Do your sheets still feel crisp? Is your duvet cover looking tired?
Sometimes a bedding refresh makes more of a difference than a new mattress. Fresh linen, a quality duvet cover, and pillows that actually support your neck can transform how a bed looks and feels — without the four-figure price tag.
While you're refreshing the mattress, it might be time to refresh the bedding too. Browse our textiles collection for linen and bedding designed to feel as good as it looks.
