To clean a mattress, I'd strip the bed, vacuum it and blot any stains with as little water as I can manage. Then deodorize with baking soda, let it dry right through, and put a washable protector back on. Water is the part I'd be most careful with.
Cleaning a mattress is the job of lifting dust, skin flakes, sweat and stains out of its top layers without soaking the foam and coils underneath. Restwell and Restonic, the two main mattress makers our Duncan store sells, both warn against letting a mattress get wet. Both also say a stain can end a warranty claim. Their own wording is further down, along with what HealthLink BC says about cleaning up after the flu or a stomach bug.
At Merit Home Furniture we sell mattresses and protectors to homes up and down Vancouver Island, where a damp winter makes drying the slowest step. None of this needs special equipment. A vacuum, some white cloths, clear dish soap, baking soda and a fan cover almost every job.
How to clean a mattress at home, step by step
A home mattress clean is mostly waiting for things to dry, so pick a day the bed can stay bare until evening. The supplies are a vacuum with its upholstery tool, white cloths or paper towels, and a bowl of cold water. Add a little clear dish soap, a box of baking soda and a fan. White cloths matter because a coloured one can leave dye on the ticking, the quilted fabric on the outside of the mattress.
- Strip the bed. Sheets, pillowcases, the protector and any pad all go in the wash. Open a window or run a fan, because the room needs moving air for the rest of the day.
- Vacuum the top and sides. Go slowly with the upholstery tool, especially along the seams and the dips in the quilting, where dust settles. For people with dust allergies, HealthLink BC suggests a vacuum with a HEPA filter or a double-thickness bag. An ordinary bag can let fine dust back into the room.
- Spot clean what's left. Blot each mark with a barely damp cloth, using the stain-by-stain method further down.
- Deodorize. Once the spots are dry, sift a thin layer of baking soda over the top and leave it for several hours before vacuuming it up.
- Dry it completely. Leave the mattress bare with the fan on it. Feel the cleaned spots with the back of your hand, and wait until they feel as dry as the rest.
- Protect it. A clean, dry, waterproof protector goes on first, then the fitted sheet.
Turning the mattress belongs on the same day, and the makers ask for it. Restwell's care brochure asks owners of its one-sided Never Turn beds to rotate them head to foot. That means every 2 weeks for the first 3 months, then once a month. Turning spreads the wear. Cleaning day is a handy reminder to do it. With the bed bare, a wooden frame or headboard gets the damp-cloth wipe wood furniture needs.
What is the right thing to clean a mattress with?
The right thing to clean a mattress with is the mildest cleaner that does the job. For most marks, I'd reach for cold water with a drop of clear dish soap, applied on a cloth. I'd start there because of what the makers print. Restonic's care list says "Don't use cleaning fluids or allow your mattress to get wet". Restwell's brochure says not to use dry cleaning fluid of any type, because those chemicals damage some of the materials inside.
For blood and sweat marks, I'd stick to cold water. Vomit is the exception, because HealthLink BC calls for soap and hot water there, as the illness section explains. Keep the cloth damp, never dripping, so the water stays in the ticking instead of running down into the comfort layers.
Enzyme cleaners and hydrogen peroxide turn up in a lot of stain advice. Neither appears in Restwell's or Restonic's care text. Peroxide can also lighten coloured fabric. I'd test either one on a hidden corner of the side panel first, knowing the warranty risk is yours.
Health Canada is blunt about bleach. Its advisory reads "Never mix any cleaning product with household bleach", because bleach reacts with any product containing ammonia or an acid. Vinegar counts as an acid, glass cleaners are often ammonia-based, and the reaction gives off toxic gases such as chloramine. Vinegar sprays and bleach both turn up in home stain remedies, so the warning applies here.
Can you use Dawn on a mattress?
Dawn or any other clear dish soap is fine on a mattress in a small amount. Mix a drop into a cup of cold water, dip a cloth, wring it out hard and dab. Afterwards, go over the spot with a second cloth dampened in plain water, because soap left in the fabric holds on to dirt. Skip coloured or scented soaps, which can leave their own mark. The amount of liquid matters more than the brand.
How to spot clean a mattress, stain by stain
Spot cleaning a mattress works from the outside edge of a stain toward the middle, so the mark doesn't spread into a ring. Press a cloth onto the spot, lift it, and move to a clean part of the cloth. Rubbing pushes the stain deeper and roughs up the fabric. Finish every spot by blotting with a dry towel, pressing down hard, then leave it to air dry.
| Stain | What to do first |
|---|---|
| Fresh spill | Blot straight away with a dry white cloth. Then dab with soapy cold water, then plain water, then press dry. |
| Blood | Cold water only. Dab, switch to a clean part of the cloth often, and stop once the cloth comes away clean. |
| Sweat or yellowing | Soapy cold water lifts fresh marks. Old yellow patches have usually soaked into the fill and may only fade. |
| Urine | Blot hard with dry towels first, then treat it like a fresh spill. Baking soda on the dry spot helps with the smell. |
| Vomit | Gloves on, and follow HealthLink BC's steps in the section on cleaning after an illness. |
Yellow stains deserve an honest answer. A mark built up over months from sweat and body oils has gone below the ticking, and gentle cleaning only lightens it. For pee stains and bedwetting on a mattress, the lasting fix is a waterproof protector.
A stain that reaches the foam is also the one most likely to affect the warranty. That part is written into each maker's paperwork, and it's set out in the next section.
Restwell and Restonic mattress care rules, and what stains do to the warranty
Stains can affect a mattress warranty, and for both main makers we sell at Duncan that's in their own printed terms. Merit lists 18 mattresses from these two makers for our Duncan store, 8 Restwell and 10 Restonic, from $698.00 to $4,315.00 before applicable taxes, depending on the model and size. Here is what each maker says about keeping one clean.
| Rule | Restwell care brochure | Restonic FAQ |
|---|---|---|
| Stains | "Any kind of stain(s) WILL void your warranty" | "any stains will void your manufacturer warranty" |
| Water | Don't let it get wet; protect it from all liquids | Don't let it get wet |
| Cleaners | No dry cleaning fluid of any type | No cleaning fluids |
| Protection | Recommends a high quality mattress protector | Says a protector keeps the warranty valid |
| Turning | Every 2 weeks for 3 months, then monthly | Monthly for the first 6 months then quarterly |
Restwell's warranty also says it may refuse service when, on inspection, a mattress "is soiled or found to be in an unsanitary condition". Restonic's FAQ says a soiled, stained or ripped mattress voids the warranty "regardless of where your mattress is damaged". In other words, a coffee ring on the corner can end a claim about a sag in the middle.
A note on the Restonic column: Restonic's Canadian web address wasn't showing a working site when we checked, so those lines come from its US site. The warranty card that comes with your mattress is the one that counts, so keep it with your receipt. Restwell's brochure also asks owners not to remove the law tag, the label sewn on at the end, because the warranty code is printed on it.
At Merit we stand behind the maker's warranty, order any parts and handle the repair. The maker still inspects the claim, though, and a stain can stop it at that point. Our guide to what each furniture maker's warranty leaves out covers the rest of the store. Every Restwell model and build is in our list of Restwell beds and their prices.
Deodorizing a mattress with baking soda
Deodorizing a mattress with baking soda works because the powder soaks up odours sitting in the top layer of fabric. Here is how to clean a mattress with baking soda. Make sure the surface is dry, since baking soda on a damp spot turns to paste. Shake a thin, even layer over the whole top through a sieve, work it in lightly with a soft brush, and leave it for several hours. Overnight is fine if you have somewhere else to sleep. Then vacuum it all up slowly with the upholstery tool.
Baking soda absorbs smells; it isn't a disinfectant. A smell that comes back every time the room warms up is coming from deeper in the mattress, and surface cleaning won't reach it.
A new mattress can smell too. Restonic's FAQ says the odour from new foam "should dissipate within a week", and it suggests airing the mattress out for a few days. If the smell carries on past that, Restonic says to contact the retailer, which for our customers means us.
How do you sanitize a mattress without washing it?
You can't truly sanitize the inside of a mattress at home. A home clean takes dust and stains off the surface, airs it out and keeps it dry. Disinfectant sprays are the cleaning fluids Restonic asks owners to keep off. A steam cleaner is hot water in another form, which is the wetting both makers warn about. HealthLink BC does mention steam for carpets in a dust mite plan, but it doesn't say the same for mattresses.
The part you can sanitize is the protector, in the washing machine. It catches what would otherwise soak in, which makes it the real cleaning tool for a mattress.
Cleaning a mattress after you've been sick
Cleaning a mattress after you've been sick starts with the bedding, because the sheets, pillowcases and protector take most of what a sick person leaves behind. HealthLink BC says an adult with the flu can spread the virus from about one day before to 5 days after symptoms start. Young children may spread it for longer. I'd wash everything on the bed once the sick person is up and about, then vacuum the mattress and let the bare bed air out. Its flu file also lists cleaning and disinfecting surfaces that people frequently touch, which is the place to put the effort.
Vomit is a bigger job, and HealthLink BC's norovirus file sets out the steps. It says to wear disposable gloves and use paper towels to soak up excess liquid, bagging them with any solid matter. Then clean the soiled area with soap and hot water, using a cloth you won't use anywhere else. Next it says to disinfect the washed area with a fresh bleach solution, made by adding 20 ml of bleach to 1 litre of water. It adds that household cleaners other than bleach don't work as well against noroviruses. Gloves and cloths go in the garbage, and hands get at least 20 seconds with soap and water.
That file doesn't mention mattresses, and here the advice and the mattress makers pull in different directions. Bleach can lighten the ticking, and both makers say to keep cleaning fluids and water off. My own approach would be to soak up as much as possible, clean with soap and the least hot water that does the job, and get the spot dry fast. For questions about disinfecting, or about anyone who is very sick, call 8-1-1 to reach HealthLink BC, or talk to your doctor. The line for the deaf and hard of hearing is 7-1-1. HealthLink BC also says to see a health care provider if vomiting or diarrhea lasts more than 2 or 3 days, or if dehydration is a concern. Their advice comes ahead of anything here.
The laundry is simpler. HealthLink BC says to wash laundry soiled with vomit or diarrhea in a washing machine using detergent. It also notes the virus can stay in the stool for as long as 2 weeks after the vomiting and diarrhea stop. So in a house with a child recovering from a stomach bug, the protector and sheets may need washing more than once. Whatever cleaner goes on, Health Canada's advisory says to air the home during and after, with windows or doors open and exhaust fans running.
How to clean a mattress cover, a protector or a foam topper
How to clean a mattress cover depends on which cover it is. A protector is made for the washing machine. A zip-off cover on a foam bed may or may not be, and the quilted cover sewn onto most coil mattresses never comes off at all.
A protector is the easy one. Every Health Guard protector listed for our Duncan store says "Machine washable" on its Merit listing, and the care tag sewn into it gives the temperature and dryer setting. Health Guard's FAQ recommends washing a protector every 2 months, and more often when there are spills, accidents or allergy concerns. HealthLink BC goes further for people controlling dust mites: wash bedding, including mattress covers, in hot water every week. Merit lists 7 Health Guard protectors for Duncan, priced by size as below, before applicable taxes.
| Health Guard protector | Twin to California king |
|---|---|
| Premium Terry | $49.00 to $79.00 |
| Cotton Touch | $89.00 to $129.00 |
| Tencel Dream | $109.00 to $149.00 |
| Active Charcoal | $169.00 to $249.00 |
| Organic Bamboo | $169.00 to $249.00 |
| Bamboo Plus | $189.00 to $249.00 |
| Cool Ice | $189.00 to $249.00 |
Whether a protector is worth buying at all, and which type does which job, is covered in Merit's guide to mattress protectors and the warranties behind them.
A zip-off cover should only come off if the maker's label says it can be washed. A foam bed's cover is cut to a snug fit, and one that shrinks in the wash may not go back on. If the label says spot clean only, treat it like the mattress itself.
A sewn-on cover gets the same care as the rest of the mattress: vacuum, blot and dry. Covers can be fine fabrics, too. The Restwell Robin, for one, has a Tencel cover with a silk and wool fibre blend, by its listing. Nothing in Restwell's care brochure suggests taking it off for a wash.
How to clean a foam mattress or a foam topper comes down to the same rule with higher stakes. Foam holds water like a sponge and gives it up slowly, so a spill on a foam bed needs fast blotting and very little added water. If a topper has a removable cover, wash the cover by its label and leave the foam out of the machine.
Drying a mattress in a damp Island house, and when mould means it's done
Drying a mattress quickly is the step that decides whether a clean goes well, and the Island's wet months make it slow. Health Canada's advice on mould is to fix the cause and dry wet surfaces within 48 hours. On a grey Cowichan day, that means a fan on the damp spot, the heat on and a dehumidifier if you have one. On a dry day, an open window does much of the work.
A drier bedroom helps with dust mites too. HealthLink BC notes they do well where humidity is greater than 50% and don't do well in dry conditions.
Mould is where cleaning stops. Health Canada says small patches, under 1 square metre, can be cleaned with soap and water when they're on non-porous surfaces. It names glass, metals, leather, plastics and vinyl as non-porous. A mattress is fabric, fibre and foam, so it isn't on that list. The same infographic names pillows and mattresses among the things that can get mouldy, and it says "Throw away what you can't clean". If anyone in the house has breathing trouble that might be linked to mould, that's a question for your doctor.
When a mattress is past saving, Merit's Duncan store can take the old one away when it delivers the new one. From Duncan, old furniture is usually $25 to $50 a piece, and sometimes included, per the delivery and haul-away terms, so ask whether that covers your mattress. If yours isn't mouldy but you're wondering whether it's worn out anyway, the signs a mattress has reached the end are worth reading first.
Mattress cleaning habits that do more harm than the stain
- Spraying or pouring a cleaner straight onto the mattress. It runs past the ticking into the foam, where it can't be blotted out.
- Steam cleaners, carpet shampooers and wet vacuums. Each one puts water into the mattress, which both makers ask owners to avoid.
- Mixing bleach with vinegar, ammonia or another cleaner. Health Canada warns the mix gives off toxic gas.
- Dry cleaning fluid of any type, which Restwell says will damage some of the materials inside.
- Cutting off the law tag. On a Restwell bed it carries the warranty code.
- Making the bed over a spot that's still damp. The sheet traps the moisture, and on the Island a damp mattress can stay damp for days.
If a new Merit mattress picks up a stain in its first weeks, I'd rather you blotted it, let it dry and called us. Scrubbing can wait. A small mark is easier to talk through than one that a strong cleaner has made bigger. And if there's no protector on the bed yet, that's the cheapest thing to fix.
Getting a mattress protector or a new mattress from our Duncan store
We don't mail protectors, pillows or sheets. They can be picked up free at our Duncan store, 107 Ingram St, usually about 2 business days after they arrive there, or added to a furniture or mattress delivery. We call when the order is ready. All of the mattress protectors and pads we list are in one collection.
A Restwell or Restonic mattress from Duncan takes 2 to 3 weeks before it's ready for pickup or delivery. Delivery from Merit's Duncan store is $150 across the Island, with assembly included, and a mattress going a long way across the Island may need a different shipping method. Some of the beds are on display at our Duncan store, so call to ask which ones are set up before you come in. Nobody will follow you around while you try them, and taking a protector home with the new bed means it goes on from the first night.
Call the Duncan store, (250) 746-5527
Our guides on choosing, sizing and caring for a bed are gathered in one place. If cleaning can't save yours, you can compare every Restwell mattress we sell, the Restonic collection and mattresses from every maker we carry.
Where these mattress cleaning and warranty details come from
- Restwell Sleep Products, Warranty and Mattress Care brochure 2024, checked November 2026.
- Restonic (US site), Frequently Asked Questions: mattress care, stains and rotation, checked November 2026.
- Health Guard, Cotton Terry Mattress Protector and protector FAQ, checked November 2026.
- HealthLink BC, Norovirus, HealthLinkBC File 87 (updated September 1, 2026), checked November 2026.
- HealthLink BC, Facts about influenza (flu), HealthLinkBC File 12b (updated September 25, 2025), checked November 2026.
- HealthLink BC, Controlling dust, dust mites and other allergens in your home, checked November 2026.
- Health Canada, Reduce your risk from toxic gases: never mix bleach with other cleaning products (RA-62070), checked November 2026.
- Health Canada, Infographic: Mould, checked November 2026.
- Merit Home Furniture's live listings for the Restwell, Restonic and Health Guard products named here, and our delivery page, read November 1, 2026.