Quick Answer: Cleaning a mattress with baking soda is one of the simplest, most effective ways to remove odours and freshen your sleep surface. Sprinkle a generous layer across the bare mattress, leave it for 8 to 24 hours, then vacuum thoroughly. Baking soda neutralises acids, absorbs moisture, and costs less than two dollars per treatment.
In This Guide
Reading Time: 13 minutes
Your mattress works hard. Eight hours a night, every night, absorbing sweat, skin cells, body oils, and the occasional coffee spill. Over time, even the best mattress starts to carry odours you might not notice because you are sleeping in them every single night.
Here is the good news. You probably already have the best mattress cleaner sitting in your kitchen cupboard. Cleaning a mattress with baking soda is safe, affordable, and genuinely effective. No harsh chemicals, no expensive equipment, no calling in a professional. Just a box of sodium bicarbonate, a vacuum, and a bit of patience.
At Mattress Miracle in Brantford, we have been helping families choose and care for their mattresses since 1987. We have seen what proper maintenance does for mattress longevity, and we have seen what neglect does too. This guide covers everything you need to know about using baking soda to keep your mattress clean, fresh, and lasting years longer.
Why Baking Soda Works So Well on Mattresses
Baking soda, or sodium bicarbonate, is not just a folk remedy. There is real science behind why it works as a mattress cleaner. Understanding the chemistry helps explain why this simple powder outperforms many commercial spray products.
The Science of Sodium Bicarbonate
Baking soda is amphoteric, meaning it reacts with both acids and bases to neutralise them. Most mattress odours are acidic in nature, including sweat (which contains lactic acid, uric acid, and fatty acids) and urine (uric acid). When baking soda contacts these compounds, it undergoes an acid-base reaction that converts the odour-causing molecules into neutral salts, carbon dioxide, and water. The result is genuine odour elimination, not just masking.
Beyond neutralising odours, baking soda is a mild desiccant. It absorbs moisture from the mattress surface and upper layers, which matters more than most people realise. A mattress can absorb up to half a litre of sweat per night. That accumulated moisture creates an ideal breeding ground for dust mites, mould spores, and bacteria.
Baking soda also has a mild abrasive quality. When you vacuum it up after treatment, it helps lift surface debris, dead skin cells, and dust mite waste from the fabric. Think of it as a dry shampoo for your mattress.
Why Not Just Use a Spray Cleaner?
Commercial mattress sprays have their place, but they come with a significant drawback. They add moisture to your mattress. Liquid cleaners that soak into foam or batting layers can take days to dry fully, and damp conditions inside a mattress promote mould and mildew growth. Baking soda, by contrast, absorbs moisture rather than adding it.
Brad, Owner (since 1987): "I have been selling mattresses for nearly four decades, and the number one thing that shortens a mattress's life is moisture. Spills, humidity, sweat buildup. Baking soda is brilliant because it pulls moisture out instead of pushing it in. I recommend it to every customer who asks about mattress care."
What You Need Before You Start
Cleaning a mattress with baking soda requires very little equipment. Most of what you need is already in your home. Here is a complete list so you can gather everything before you begin.
Your Baking Soda Cleaning Kit
- Baking soda: One full box (454 grams) for a queen or king mattress, half a box for a twin or double
- Vacuum cleaner: With an upholstery attachment (critical for getting into seams and tufting)
- Fine mesh sieve or flour sifter: For even distribution across the surface
- Clean cloths or paper towels: For pre-treating stains
- White vinegar: For biological stains (urine, blood, vomit)
- Mild dish soap: For sweat and body oil stains
- Cold water: Never hot, which can set protein-based stains
- Spray bottle: For applying vinegar or soap solution
- Essential oils (optional): Lavender or tea tree for added freshness
A quick note about the vacuum. A standard household vacuum with an upholstery attachment works fine. If you have a handheld vacuum or a shop vac, those work too. The key is having enough suction to pull the fine baking soda powder out of the mattress fabric. Weak suction will leave residue behind, which can feel gritty under your sheets.
Step-by-Step: How to Clean a Mattress with Baking Soda
Follow these seven steps for a thorough, effective mattress cleaning. The process itself takes about 20 minutes of active work, but you will need to plan for the sitting time.
Step 1: Strip and Wash All Bedding
Remove everything from the mattress. Sheets, pillowcases, mattress protector, mattress topper, duvet cover. Wash all of it in hot water, at least 55 degrees Celsius. This temperature kills dust mites and their eggs, which cold water cannot do. If your mattress protector has a waterproof membrane, check the care label first. Some waterproof protectors should be washed in warm rather than hot water to preserve the membrane.
Step 2: Vacuum the Bare Mattress
Before applying baking soda, vacuum the entire mattress surface using the upholstery attachment. Go over the top, sides, and if you can flip or tilt it, the bottom. Pay particular attention to the quilted crevices, piping along the edges, and any tufting buttons where dust, hair, and skin cells accumulate. This initial vacuuming removes loose debris so the baking soda can work directly on the fabric rather than sitting on top of a layer of dust.
Step 3: Pre-Treat Visible Stains
Before the baking soda goes on, address any visible stains. Different stains need different approaches:
- Sweat and body oil stains: Mix a teaspoon of dish soap into a cup of cold water. Dab the solution onto the stain with a clean cloth. Blot, never rub, and work from the outside edge inward to prevent spreading.
- Urine stains: Spray a 50/50 mix of white vinegar and cold water onto the stain. The vinegar neutralises the ammonia. Blot with a dry cloth. You will notice a mild fizzing reaction, which is the acid-base neutralisation at work.
- Blood stains: Use cold water only. Hot water sets blood stains permanently. Dab with cold water and blot repeatedly. For dried blood, a paste of baking soda and cold water applied to the spot for 30 minutes can help lift it.
The most important rule with any mattress stain is to never soak the mattress. Use the minimum amount of liquid needed. Excess moisture trapped inside a mattress is far worse than a surface stain.
Step 4: Apply Baking Soda Generously
Now for the main event. Cleaning a mattress with baking soda requires a generous, even layer across the entire surface. Do not be shy with the amount. For a queen-size mattress, use the full 454-gram box. Pour the baking soda into a fine mesh sieve or flour sifter and gently tap it as you move across the mattress. This creates a more uniform layer than pouring directly from the box.
For areas with lingering odours or stains you just pre-treated, apply a thicker layer. You can also gently press the baking soda into the fabric with clean, dry hands. This pushes the powder into contact with the fibres where odours are trapped.
Want a little extra freshness? Mix 10 to 15 drops of lavender essential oil into the baking soda before sifting it onto the mattress. Stir the oil into the powder in a bowl with a fork until evenly distributed. Lavender has mild antibacterial properties and the scent may help promote relaxation at bedtime.
Step 5: Let It Sit for 8 to 24 Hours
This is the step most people rush, and it makes all the difference. The longer baking soda sits on your mattress, the more moisture and odour it absorbs. A minimum of 30 minutes will provide some benefit, but 8 to 24 hours is where you see real results.
The ideal approach is to apply the baking soda first thing in the morning and vacuum it off before bed. If you can leave it for a full 24 hours, even better. Open a window in the bedroom if the weather allows. Sunlight and fresh air work alongside the baking soda, as UV light has natural antibacterial properties.
Step 6: Vacuum Thoroughly
After the baking soda has done its work, vacuum the entire mattress surface using the upholstery attachment on a high suction setting. Make slow, overlapping passes. Rush this step and you will feel gritty residue under your sheets tonight.
Pay extra attention to seams, piping, and tufting where baking soda settles into crevices. Run the attachment along the edges and sides of the mattress. If your vacuum has a crevice tool, use it along the piped edges. Make two complete passes over the entire surface to be thorough.
Step 7: Protect and Remake the Bed
Once the mattress is clean and free of baking soda residue, this is the ideal time to add a quality mattress protector if you do not already use one. A waterproof, breathable protector prevents future stains from reaching the mattress and significantly reduces how often you need to deep clean.
Put on your freshly washed sheets and bedding. Take a moment to appreciate that clean-mattress feeling. It is one of the most satisfying household tasks you will ever complete.
Tackling Specific Stains and Odours with Baking Soda
The basic baking soda treatment handles general odours and light soiling beautifully. But certain stains and smells need a more targeted approach. Here is how to handle the most common mattress stain situations using baking soda as your primary weapon.
Sweat Stains and Yellowing
Yellow sweat stains are the most common mattress complaint we hear at the shop. They are caused by a combination of body oils, sweat, and the natural oxidation process that happens when these substances react with the mattress fabric over time.
For sweat stains, make a paste of baking soda and a small amount of hydrogen peroxide (3% household strength). Mix three tablespoons of baking soda with one tablespoon of peroxide and a drop of dish soap. Apply the paste to the yellowed area, let it dry completely (usually 1 to 2 hours), then vacuum it up. The peroxide provides mild bleaching action while the baking soda absorbs the residue.
A word of caution: test this on a small, inconspicuous area first. Some mattress fabrics may lighten unevenly with peroxide. On white or light-coloured mattress tops, it works beautifully.
Urine Odours (Children and Pets)
If you have young children or pets, mattress accidents are a fact of life. Urine contains uric acid, which standard cleaning often fails to break down completely. That is why urine odours can return even after you think the mattress is clean.
The Vinegar and Baking Soda Method for Urine
Step 1: Blot up as much liquid as possible with dry towels. Press firmly and use multiple towels.
Step 2: Spray the area with undiluted white vinegar. The acetic acid breaks down uric acid crystals.
Step 3: While the area is still damp, cover it generously with baking soda. You will see fizzing. This is the chemical reaction that neutralises the odour compounds.
Step 4: Leave the baking soda until completely dry, which may take 8 to 10 hours.
Step 5: Vacuum thoroughly. The area should be odour-free. Repeat if needed for old or heavily saturated stains.
Musty or Mildew Smells
Musty odours indicate moisture has been sitting in the mattress. This is particularly common in southern Ontario where humidity can be high from June through September. Brantford, sitting in the Grand River valley, gets its share of humid summer nights.
For musty smells, baking soda alone may not be enough. Apply a generous layer of baking soda mixed with a few drops of tea tree essential oil, which has antifungal properties. Leave it for a full 24 hours. After vacuuming, stand the mattress on its side near an open window or in a room with a fan running for several hours. Air circulation is key to clearing residual moisture.
If the musty smell persists after two treatments, the moisture issue may be deeper than surface treatment can reach. This is a sign that a mattress topper or the mattress itself may need replacing.
Smoke Odours
Smoke odours, whether from cigarettes, cooking, or wildfire season, bond strongly to fabric fibres. Baking soda is one of the few household products that can break these bonds rather than simply masking the smell.
For smoke odours, apply a thick layer of baking soda and leave it for 24 hours. Vacuum, then repeat the process two or three times. Between applications, leave the mattress uncovered with a window open. Charcoal-based odour absorbers placed near the mattress can help between baking soda treatments.
Seasonal Mattress Care in Southern Ontario
Living in Brantford and the surrounding areas, your mattress faces unique seasonal challenges. Winter months bring dry indoor air from heating systems, which can cause mattress fabrics to become dusty and staticky. Summer brings humidity that encourages dust mite populations to boom. We recommend cleaning a mattress with baking soda at each seasonal transition: once in spring and once in fall at minimum, with additional treatments in July and August when humidity peaks in the Grand River valley.
How Often Should You Clean Your Mattress with Baking Soda?
The short answer is every three to six months. But the right frequency depends on your specific situation.
| Situation | Recommended Frequency | Why |
|---|---|---|
| General maintenance, no allergies | Every 6 months | Prevents odour buildup and keeps the sleep surface fresh |
| Allergy or asthma sufferers | Every 1 to 2 months | Reduces dust mite allergens, which are a primary indoor trigger |
| Pet owners (pets on or near bed) | Every 2 to 3 months | Manages pet dander, hair, and odours |
| Young children (accident-prone ages) | After each accident, plus quarterly | Prevents uric acid crystals from building up in the mattress |
| Hot sleepers or night sweats | Every 2 to 3 months | Addresses higher-than-average moisture absorption |
| Humid climate or no air conditioning | Monthly during summer | Combats moisture and potential mould growth |
| Using a mattress protector | Every 6 to 12 months | The protector catches most of what would otherwise reach the mattress |
Dorothy, Sleep Specialist: "I tell customers to think of baking soda cleaning as seasonal maintenance, like changing the furnace filter. Spring and fall cleanings are the minimum. If you have allergies or pets, bump it up. The difference in how your bedroom smells after a baking soda treatment is something you notice right away, and your sleep quality may improve because of it."
Pair Cleaning with Mattress Rotation
Every time you clean your mattress with baking soda is also a good time to rotate it 180 degrees (head to foot). This distributes body weight impressions more evenly across the sleep surface. If you have a flippable mattress like the Restonic Revive Reflections ET, flip it over at the same time for maximum longevity.
What Lives in Your Mattress?
Research published in the Journal of Allergy and Clinical Immunology found that the average mattress can harbour between 100,000 to 10 million dust mites. These microscopic creatures feed on dead skin cells and thrive in warm, humid environments. It is not the mites themselves that cause allergic reactions, but their faecal pellets, which are small enough to become airborne and inhaled. A study by the American College of Allergy, Asthma, and Immunology found that regular mattress cleaning reduced allergen levels by up to 90%, significantly improving sleep quality and reducing nighttime allergy symptoms.
Protecting Your Mattress After Cleaning
Cleaning a mattress with baking soda is effective, but prevention is even better. After you have done the work of deep cleaning, take steps to protect your mattress so it stays fresher longer between treatments.
Invest in a Quality Mattress Protector
A good mattress protector is the single most effective thing you can do for mattress hygiene. It creates a barrier between your body and the mattress surface, catching sweat, skin cells, spills, and allergens before they penetrate the mattress.
Look for a protector that is waterproof but breathable. Modern membrane protectors use microscopic pores that block liquids while allowing air and moisture vapour to pass through. This means you stay cool and comfortable while the mattress stays dry.
At Mattress Miracle, we carry protectors designed specifically for the mattresses we sell. A protector is a small investment, typically between $60 and $120 for a queen, that can add years to your mattress's lifespan and dramatically reduce how often you need to deep clean.
Wash Bedding Weekly
Your sheets are the first line of defence. Washing them weekly in hot water removes the sweat, oils, and skin cells that would otherwise migrate through to the mattress. Pillowcases should be changed even more frequently if you have oily skin or use hair products at night.
Allow Your Mattress to Breathe
When you get up in the morning, pull back the covers and let the mattress air out for 15 to 20 minutes before making the bed. This allows overnight moisture to evaporate rather than being trapped under layers of bedding. It is a simple habit that makes a real difference over time.
Control Bedroom Humidity
Keep your bedroom humidity between 30% and 50%. In Brantford's humid summers, a dehumidifier in the bedroom can help. In winter, when furnace heat dries the air, a humidifier may be needed. Both extremes affect your mattress. Too much humidity feeds dust mites and mould, while too little can dry out foam layers and reduce comfort.
The Mattress Care Calendar
Weekly: Wash sheets and pillowcases in hot water. Air out the mattress for 15 minutes each morning.
Monthly: Vacuum the mattress surface with the upholstery attachment. Check for stains.
Quarterly: Full baking soda treatment. Rotate the mattress 180 degrees. Wash the mattress protector.
Annually: Inspect the mattress for sagging, lumps, or structural issues. Consider whether it is time for a replacement.
Common Mistakes to Avoid When Cleaning a Mattress with Baking Soda
The process is straightforward, but a few common errors can reduce the effectiveness or even cause problems. Here is what to watch out for.
Using Too Little Baking Soda
A light dusting will not do much. You need a visible, generous layer across the entire surface. Think of it like a light snowfall covering the mattress. One full box for a queen or king is about right. Baking soda is inexpensive, so do not skimp.
Not Leaving It Long Enough
Thirty minutes is better than nothing, but it is not enough time for the baking soda to absorb deep-set odours and moisture. Eight hours should be your minimum target. If you can manage 24 hours, do it. Plan the cleaning for a day when you can sleep elsewhere, or time it so the baking soda goes on in the morning and comes off at bedtime.
Using a Wet Vacuum or Steam Cleaner First
Some guides recommend steam cleaning a mattress before applying baking soda. While steam does kill bacteria and dust mites, it also saturates the mattress with moisture. If you do not allow the mattress to dry completely before applying baking soda, you can create a damp, pasty mess inside the fabric that is very difficult to remove and can promote mould growth.
If you want to steam clean, do it on a separate day and ensure the mattress is bone dry before any baking soda treatment.
Rubbing Stains Instead of Blotting
When pre-treating stains, always blot. Rubbing pushes the stain deeper into the fabric and spreads it outward. Press a clean cloth firmly against the stain and lift. Repeat with a fresh section of cloth until no more residue transfers.
Using Scented Baking Soda Products
Some brands sell "baking soda" products with added fragrances and other chemicals. These are not the same as pure sodium bicarbonate. For mattress cleaning, use plain, unscented baking soda. The kind you would use for baking. If you want fragrance, add your own essential oils so you control what goes onto your sleep surface.
Forgetting the Sides and Edges
Odours and dust do not stop at the top surface. The sides of your mattress, especially the piped edges, collect dust and absorb ambient odours from the room. Apply baking soda to the sides as well, or at the very least vacuum them thoroughly.
When Baking Soda Is Not Enough
Baking soda handles most mattress cleaning needs, but there are situations where you may need more help.
Deep-set mould or mildew: If you can see mould on the mattress surface or smell a persistent musty odour after multiple treatments, the mould may have penetrated deeper than baking soda can reach. This is a health concern, and in many cases, the mattress needs to be replaced.
Severe structural damage: If your mattress has deep body impressions greater than 3 centimetres, lumps, or broken coils, no amount of cleaning will restore comfort. These are signs it is time for a new mattress. At Mattress Miracle, we carry options starting from comfortable, well-built innerspring models up to premium Restonic mattresses with over 1,200 individually wrapped coils.
Bed bugs: Baking soda does not kill bed bugs. If you suspect an infestation, contact a licensed pest control professional immediately. Do not attempt DIY treatment, as it typically spreads the problem.
Heavy biological contamination: For mattresses that have been severely contaminated by illness, flooding, or prolonged neglect, professional cleaning or replacement is the safer choice.
Shop This Topic at Mattress Miracle
Popular picks at Mattress Miracle:
Or browse all mattresses in our Brantford showroom.
Find Your Perfect Mattress at Mattress Miracle
We are a family-owned mattress store in Brantford, helping our community sleep better since 1987. Come try mattresses in person and get honest, no-pressure advice.
441 1/2 West Street, Brantford, Ontario
Call 519-770-0001Frequently Asked Questions
How long should you leave baking soda on a mattress?
Leave baking soda on your mattress for a minimum of 30 minutes, though 8 to 24 hours produces the best results for deep odour absorption. If you can time it while your bedding is in the wash, that works well. For stubborn smells, an overnight application gives the baking soda enough time to neutralise odours trapped deep in the fabric and foam layers.
Can baking soda damage a mattress?
Baking soda is safe for virtually all mattress types, including innerspring, memory foam, hybrid, and latex. It is non-toxic, mildly abrasive, and will not break down foam or fabric fibres. The only caution is to vacuum thoroughly after treatment so no residue remains in the quilting or tufting, which could feel gritty against sheets.
Does baking soda remove urine stains from a mattress?
Yes, baking soda is effective at drawing moisture and neutralising the ammonia in urine stains. For best results, first blot as much liquid as possible, then spray the area lightly with a mixture of equal parts white vinegar and water. Once the fizzing subsides, cover the area with a thick layer of baking soda and allow it to dry completely before vacuuming.
How often should you clean your mattress with baking soda?
We recommend cleaning a mattress with baking soda every three to six months. Seasonal cleaning, four times a year, aligns well with rotating or flipping your mattress. If you have allergies, pets, or live in a humid climate like southern Ontario, monthly treatments can help manage dust mites and moisture buildup more effectively.
Can I add essential oils to baking soda for mattress cleaning?
You can mix 10 to 15 drops of essential oil, such as lavender or tea tree, into a cup of baking soda before sprinkling it on your mattress. Lavender may promote relaxation while tea tree has natural antimicrobial properties. Be sure to mix thoroughly to distribute the oil evenly through the powder. However, avoid using essential oils if you have sensitive skin or respiratory conditions.
Sources
- Portnoy, J., et al. (2013). Environmental assessment and exposure reduction of cockroaches: A practice parameter. Journal of Allergy and Clinical Immunology, 132(4), 802-808. doi.org/10.1016/j.jaci.2013.07.025
- Arlian, L.G., et al. (2001). Reducing relative humidity is a practical way to control dust mites and their allergens in homes in temperate climates. Journal of Allergy and Clinical Immunology, 107(1), 99-104. doi.org/10.1067/mai.2001.112119
- Okamoto-Mizuno, K., & Mizuno, K. (2012). Effects of thermal environment on sleep and circadian rhythm. Journal of Physiological Anthropology, 31(1), 14. doi.org/10.1186/1880-6805-31-14
- Jacobson, B.H., et al. (2008). Effect of prescribed sleep surfaces on back pain and sleep quality in patients with low back pain. Journal of Chiropractic Medicine, 7(3), 85-93. doi.org/10.1016/j.jcme.2008.02.001
- Tovey, E.R., et al. (2003). Mattress dust mite allergen levels: Effect of covering and washing. Clinical & Experimental Allergy, 33(12), 1656-1661. doi.org/10.1111/j.1365-2222.2003.01810.x
Visit Our Brantford Showroom
We are located at 441½ West Street in downtown Brantford. Free parking available. Our team does not work on commission, so you get honest advice based on your needs.
Mattress Miracle , 441½ West Street, Brantford, ON · (519) 770-0001
Hours: Monday–Wednesday 10am–6pm, Thursday–Friday 10am–7pm, Saturday 10am–5pm, Sunday 12pm–4pm.