"The first thing we tell every delivery customer is the same: put the protector on before the first night. Memory foam cannot be soaked or scrubbed the way an innerspring can, so once a spill soaks deep into the foam, you are mostly stuck with it. A protector that costs less than a tank of gas prevents the one problem you cannot fix later."
Dorothy Balicki, Mattress Miracle
Memory foam is a dense polyurethane foam that softens with body heat and moulds to your shape. That same structure is why it cleans differently from a regular mattress: the foam behaves like a sponge. Soak it and water sits deep in the cells, where it dries slowly and mould can take hold. So the rule with a memory foam mattress is to clean the surface with as little moisture as possible, then dry it completely. Both the Asthma and Allergy Foundation of America (AAFA) and the Mayo Clinic recommend washing bedding weekly in hot water and keeping indoor humidity under 50 percent to control dust mites, and that same dry, ventilated approach protects the foam underneath. At Mattress Miracle, our family has fitted and delivered foam mattresses across Brantford since 1997, and nearly every "can I save my mattress" call we get traces back to too much water, not too little cleaning.
In This Guide
- Can You Clean a Memory Foam Mattress?
- Routine Care: Vacuum and Rotate
- How to Spot-Clean Stains on Memory Foam
- Deodorizing With Baking Soda
- What Never to Do to Memory Foam
- Drying the Mattress Completely
- Prevention: A Mattress Protector
- Do Stains Void Your Warranty?
- Frequently Asked Questions
Reading time: 8 minutes
Can You Clean a Memory Foam Mattress?
Yes, you can clean a memory foam mattress, but only on the surface and only with very little moisture. You cannot deep-clean it the way you might shampoo a carpet. The foam has no airflow channels to push water back out, so anything you pour in tends to stay in. The safe method is simple: lift off the bedding, vacuum the surface, treat stains with a barely damp cloth, deodorize with baking soda, and dry it thoroughly. Everything below is just detail on doing each of those steps without harming the foam.
This is the one place a memory foam mattress differs sharply from a coil or hybrid bed. For cleaning any other type, our general guide to cleaning a mattress covers the broader steps. Here we stay focused on foam, because foam is the material most easily ruined by a well-meaning deep clean.
Routine Care: Vacuum and Rotate
Routine care keeps a memory foam mattress fresh and rarely needs more than a vacuum. Once a month, strip the bed and run the upholstery attachment over the whole surface and the sides to lift dust, skin cells, and the debris that feeds dust mites. Wash your sheets and any washable protector weekly in hot water at the same time.
Rotate the mattress head to foot every three to six months so you do not always sleep on the same spot. One honest caution: most memory foam and gel-foam mattresses are one-sided. You rotate them, you do not flip them, because the comfort layers are only on top. (The flippable beds we also carry are the exception, and they have their own care routine.) Rotating evens out wear and helps the mattress last closer to the full lifespan you paid for.
How to Spot-Clean Stains on Memory Foam
Spot-cleaning is the only wet cleaning a memory foam mattress should ever get. Work fast on fresh spills, use the least liquid that will do the job, and always blot instead of rubbing, since rubbing pushes the stain deeper into the foam.
The basic spot-clean
- Mix a mild cleaner: a few drops of gentle dish or laundry detergent in a cup of cool water, or a 50/50 mix of white vinegar and water for odour and light stains.
- Dampen, do not soak: wet a clean white cloth, wring it out hard, and dab the stain from the outside in.
- Blot dry: press a dry towel down to lift the moisture back out.
- Repeat gently rather than reaching for more water or a stronger chemical.
Urine and other wet stains
Urine is the most-searched memory foam stain, and the method is the same with one extra step. Blot up as much as you can with dry towels first. Then dab with the vinegar-and-water mix, which neutralizes odour, and blot again. For lingering smell, let it dry, then cover the area in baking soda for several hours and vacuum it up. Enzyme cleaners labelled safe for foam can help with set-in pet or urine odour, but apply them to the cloth, not poured onto the mattress.
Blood, sweat, and yellowing
For blood, use cold water only, since heat sets the stain. For the yellowing that sweat and body oils leave over time, the vinegar mix plus baking soda is your best gentle option. None of these need a soaking. If a stain will not lift with light, repeated dabbing, it is better to accept a faint mark than to drown the foam trying to remove it.
Deodorizing With Baking Soda
Baking soda is the safest deodorizer for memory foam because it works dry. Sift a thin, even layer over the whole surface, let it sit for several hours (overnight is better), then vacuum it off completely. The baking soda pulls out trapped moisture and odour without adding any liquid to the foam. Doing this once a season, and after any spill, keeps the mattress smelling neutral. If your mattress is brand new and the smell is a faint chemical one rather than an odour, that is normal off-gassing, not something to scrub. Our guide to the new-mattress smell explains how to air it out.
What Never to Do to Memory Foam
Most ruined memory foam mattresses are not dirty. They are waterlogged or chemically damaged from a cleaning that went too far. Avoid these five things and the foam will outlast the cleaning mistakes that wreck it:
- No steam cleaning. Steam forces hot moisture deep into the foam, the one place it cannot dry from. It is the fastest way to grow mould inside a mattress.
- No machine washing of the mattress itself (the removable cover is often machine-washable, the foam core never is).
- No soaking or saturating. If liquid pools on the surface, you have already used too much.
- No bleach, ammonia, or harsh solvents. They break down the foam structure and can leave fumes the foam holds onto.
- No drying with high heat. Hair dryers and radiators degrade foam; use airflow and time instead.
Drying the Mattress Completely
Drying is the step people skip, and it is the one that causes mould. After any spot-clean, get air moving over the mattress and do not put bedding back until the foam is dry all the way through, which can take several hours. Open a window, run a fan across the surface, or stand the mattress on its side if you can. A dehumidifier helps, especially here in southwestern Ontario, where summer humidity and basement bedrooms keep foam damp longer than you would expect. If you are in a finished basement in Brantford or Paris, give it extra drying time before you remake the bed.
Prevention: A Mattress Protector Is the Real Answer
Every step above is easier if the stain never reaches the foam. A washable, waterproof mattress protector is the single best thing you can do for a memory foam mattress. It catches sweat, spills, and the body oils that cause yellowing, and you simply toss it in the wash each week. It also helps with the dust mites that AAFA and the Mayo Clinic flag as a common allergy trigger, since you can launder it hot far more easily than you can ever clean the mattress.
We carry simple, effective options: a breathable bamboo protector starts around $59 in a queen, and a waterproof Tencel protector runs about $130. For anyone managing allergies or wanting full coverage, a zippered allergen and bed-bug encasement (about $167 in a queen) seals the whole mattress, which lines up with the allergen-barrier covers AAFA recommends. Our protector guide walks through the differences.
Do Stains Void Your Warranty?
Here is something most cleaning guides leave out: a stain can void your mattress warranty. Many manufacturers will not honour a warranty claim on a mattress with visible staining or soiling, because a soiled mattress cannot be inspected for the defect being claimed. This is standard across much of the industry, and it is the real reason a protector matters as much as any cleaning trick.
"People think the warranty is about how the mattress wears. A lot of the time the claim gets denied for a stain instead, before anyone even looks at the foam. That is why we are blunt about the protector on delivery day. It keeps the mattress clean, it keeps the warranty in play, and during the comfort-exchange window it keeps your options open too. We would rather tell you that up front than have you find out the hard way."
Brad Grose, founder, Mattress Miracle, family owned in Brantford since 1997, with 40+ years in the mattress industry
A protector also keeps your mattress eligible during our 60-day comfort guarantee, so it protects both the warranty and your ability to make a change early on. If a mattress is past saving or simply worn out, that is a different decision; our guide to how long a mattress lasts can help you tell the difference between a cleaning job and a replacement.
Frequently Asked Questions
Can you steam clean a memory foam mattress?
No. Steam forces hot moisture deep into the foam, where it cannot dry out, and that trapped moisture is the leading cause of mould inside a mattress. Memory foam should only ever be surface-cleaned with a barely damp cloth, then dried completely.
How do you get urine out of a memory foam mattress?
Blot up as much as possible with dry towels, then dab the area with a 50/50 mix of white vinegar and water to neutralize odour and blot again. Once dry, cover the spot with baking soda for several hours and vacuum it up. Use a foam-safe enzyme cleaner on the cloth, never poured on, for set-in pet or urine odour.
Does memory foam get mouldy?
It can, if it stays damp. Foam holds moisture deep in its cells, so soaking it or skipping the drying step lets mould grow where you cannot see it. Clean with minimal moisture, dry the mattress fully with airflow before remaking the bed, and keep bedroom humidity under 50 percent, especially in basements.
How often should you clean a memory foam mattress?
Vacuum the surface about once a month and wash your sheets and protector weekly. Deodorize with baking soda once a season or after any spill, and spot-clean stains as they happen. With a protector in place, that light routine is all most memory foam mattresses ever need.
Can you use vinegar and baking soda on memory foam?
Yes, both are foam-safe when used correctly. Use a diluted 50/50 white vinegar and water mix on a wrung-out cloth for stains and odour, and use baking soda dry, sprinkled on and then vacuumed off. Avoid bleach, ammonia, and harsh solvents, which damage the foam.
Sources
- Asthma and Allergy Foundation of America (AAFA). "Dust Mite Allergy: How to Identify and Treat." aafa.org
- Mayo Clinic. "Dust mite allergy: Symptoms and causes." mayoclinic.org
Visit Our Brantford Showroom
Mattress Miracle
441 1/2 West Street, Brantford, Ontario
Phone: (519) 770-0001
Hours: Mon-Wed 10-6, Thu-Fri 10-7, Sat 10-5, Sun 12-4
Not sure which protector fits your mattress, or whether a stain is worth worrying about? Come in and ask. Our team does not work on commission, so you get honest advice, white glove delivery, and old-mattress removal when it is time for a new one.