Baking soda is the most effective and safest mattress deodorizer you can use — it neutralizes acidic odors (sweat, urine, body oils) through a simple chemical reaction, not by masking them with fragrance. The process takes about 30 minutes of active time and 1–2 hours of wait time, and leaves the mattress smelling genuinely clean rather than perfumed. This guide covers the complete process for using baking soda to clean and deodorize a mattress and bed base.
What You’ll Need
Tools
- Vacuum cleaner with upholstery attachment
- Fine-mesh strainer or baking soda shaker (for even distribution)
- Soft scrub brush or clean dry cloth
- Spray bottle
Materials
- Baking soda (1–2 cups per mattress side)
- Essential oil (lavender or tea tree — optional, a few drops mixed into the baking soda)
- White vinegar (for stain pre-treatment)
- Hydrogen peroxide 3% (for biological stains — urine, blood)
- Cold water and mild dish soap (for spot cleaning)
Safety and Precautions
- Never wet the mattress interior — excessive moisture soaks into foam and causes mold and mildew growth inside the mattress layers. All cleaning should use minimal moisture that dries quickly.
- Do not mix baking soda with vinegar and then apply it to the mattress — they neutralize each other on contact. Use vinegar for pre-treatment, let it dry completely, then apply baking soda separately.
- Baking soda is safe for all mattress types — memory foam, innerspring, latex, and hybrid — but avoid rubbing it aggressively into foam which can damage the foam surface.
- Allow the mattress to dry completely before remaking the bed — making the bed over a damp mattress promotes mold and mildew.
Step-by-Step: How to Clean a Bed with Baking Soda
Step 1 — Strip the Bed and Wash All Bedding
Remove all bedding — sheets, pillowcases, mattress protector, and any mattress topper. Wash everything in the hottest water the fabric allows (check care labels — most cotton bedding tolerates 140°F, which kills dust mites). Dry on high heat. Washing bedding while you clean the mattress makes the most efficient use of your time — the mattress treatment process takes 1–2 hours anyway.
Step 2 — Vacuum the Mattress Surface
Before applying any baking soda, vacuum the entire mattress surface with the upholstery attachment. Vacuum the top, sides, and any quilted or tufted sections. Pay extra attention to seams and edges where dust, dead skin cells, and dust mite debris accumulate. This initial vacuuming removes loose debris so the baking soda can work directly on the mattress fabric rather than sitting on top of a layer of dust. Go over each section two to three times with overlapping passes.
Step 3 — Pre-Treat Stains
Address any visible stains before applying baking soda. For sweat stains and general surface discoloration: spray a small amount of undiluted white vinegar on the stain, let it sit for 5 minutes, then blot with a clean white cloth. For biological stains (urine, blood, vomit): apply hydrogen peroxide 3% directly to the stain, let it bubble for 5 minutes, then blot thoroughly. For food or drink stains: mix one teaspoon of dish soap in a cup of cold water, apply with a cloth, and blot. Always blot — never scrub, as scrubbing spreads the stain and drives it deeper into the mattress. Allow treated areas to dry partially before moving to the baking soda step.
Step 4 — Apply Baking Soda Generously
Pour 1–2 cups of baking soda into a fine-mesh strainer or a clean shaker with holes (a mason jar with a perforated lid works well). Sift the baking soda evenly over the entire top surface of the mattress in a thin, uniform layer. If you want a light scent, mix 3–5 drops of lavender essential oil (a natural antimicrobial) into the baking soda before applying. Cover every area — the full surface, including the edges. Don’t clump — the baking soda works best when it’s spread in a thin, even layer that maximizes surface contact with the mattress fabric.
Step 5 — Let It Sit for at Least 1 Hour
Allow the baking soda to sit on the mattress surface for a minimum of one hour. Two to three hours is better. If you can let it sit all day — strip the bed in the morning, treat it, and let the baking soda work all day while you go about your routine — the results are noticeably better. The baking soda absorbs acidic odor compounds from the mattress surface and trapped in the fabric. The longer it sits, the more odor it can absorb. Open a window if possible to allow any released odors to dissipate.
Step 6 — Vacuum the Baking Soda Off
After the wait time, vacuum the baking soda off the mattress completely. Use the upholstery attachment and make multiple overlapping passes in both directions to remove all residue. The baking soda changes the color slightly (typically going from bright white to a slightly yellowed or grayish tone) as it absorbs odors — this color change confirms it has been working. Make sure all baking soda is removed — sleeping on residual baking soda isn’t harmful, but the gritty texture can be uncomfortable through sheets.
Step 7 — Flip or Rotate the Mattress
Take advantage of the stripped bed to flip or rotate the mattress. Flipping puts the top surface on the bottom and vice versa — only appropriate for two-sided mattresses (older innerspring types). Most modern foam and hybrid mattresses should only be rotated (180 degrees head-to-foot), not flipped, as they have a designated top surface. Rotating distributes body impression wear more evenly. Repeat the baking soda treatment on the new top surface if desired (especially if the mattress hasn’t been treated in a while).
Step 8 — Clean the Bed Frame, Headboard, and Base
While the mattress is exposed, clean the bed frame, headboard, and base. Sprinkle baking soda into the box spring or platform slats and let sit for 30 minutes, then vacuum off. Wipe down the headboard and frame with a damp cloth — for upholstered headboards, follow the same fabric code guidelines as for upholstered furniture (W or S code, as labeled). For wood headboards, use a damp cloth and dry immediately.
Step 9 — Protect with a Mattress Cover
Once the mattress is clean, protect it going forward with a quality, waterproof mattress protector. A mattress protector prevents future stains, blocks dust mites, and dramatically reduces the frequency of deep cleaning needed. Look for a protector rated as waterproof (not just water-resistant), breathable, and machine-washable. Most experts recommend washing the mattress protector monthly, which is far easier than deep-cleaning the mattress.
Step 10 — Remake the Bed with Clean Bedding
Remake the bed with freshly washed bedding. Ensure all washed items are fully dry before use — even slightly damp bedding over a freshly cleaned mattress can introduce moisture that undoes your cleaning work. A clean, well-made bed with deodorized mattress makes an immediately noticeable difference in sleep quality.
Pro Tips for Cleaning a Bed with Baking Soda
- Do a full mattress clean every 3–6 months — quarterly cleaning keeps odors and allergens well controlled with minimal effort per session.
- Sunlight is a powerful natural sanitizer — if you can get the mattress into direct sunlight (outdoors on a sunny, dry day), UV light kills a large percentage of dust mites and bacteria. Even 2–3 hours of direct sun is beneficial.
- Baking soda is especially effective for pet odors — if a pet has been sleeping on the bed, a generous application of baking soda left overnight makes a substantial difference.
- An enzyme cleaner is more effective than baking soda for fresh urine — enzymatic products (like Nature’s Miracle) break down the uric acid crystals that cause persistent urine odor. Use an enzyme cleaner first, then baking soda as a final deodorizing step.
Frequently Asked Questions
Does baking soda actually clean a mattress?
Baking soda deodorizes rather than deep-cleans — it absorbs acidic odor compounds from the mattress surface and fabric, neutralizing smells at the molecular level. It doesn’t kill bacteria, remove deep stains, or sanitize the interior layers. For those purposes, hydrogen peroxide (for stains), enzymatic cleaners (for biological odors), or professional steam cleaning is needed. Baking soda is most effective as a regular maintenance deodorizer.
How long should I leave baking soda on the mattress?
A minimum of 1 hour, and ideally 8+ hours. The longer the baking soda stays in contact with the mattress fabric, the more odor molecules it absorbs. Many people strip the bed in the morning, apply baking soda, and leave it all day before vacuuming in the evening — this produces noticeably better results than a short 30-minute treatment.
Can I use baking soda on a memory foam mattress?
Yes — baking soda is safe for all foam mattresses including memory foam. Avoid pressing it into the foam aggressively; instead, sift it lightly over the surface and let it sit. When vacuuming off, use the upholstery attachment gently — don’t press the vacuum nozzle into the foam surface, which can damage the foam cells over time.
How do I get rid of the musty smell from a mattress?
A musty smell indicates mold or mildew growth — common in mattresses that have been dampened and not dried properly. Baking soda helps with the odor but doesn’t address the underlying mold. Treat with a spray of hydrogen peroxide 3% (which kills mold spores), let dry completely, then apply baking soda. If the musty smell persists after treatment, the mold may be in the interior layers — a severely moldy mattress should be replaced rather than treated.
How do I remove yellow stains from a mattress with baking soda?
Yellow stains from sweat and body oils benefit from a combination approach: pre-treat with a paste of baking soda mixed with hydrogen peroxide (1 tablespoon baking soda + 2 tablespoons hydrogen peroxide + 1 teaspoon dish soap). Apply to the stain, let dry completely, then vacuum off the residue. The hydrogen peroxide oxidizes the discoloration while the baking soda absorbs the odor. Multiple treatments are sometimes needed for old, set stains.
Conclusion
Cleaning a bed with baking soda is a simple, safe, and highly effective way to deodorize your mattress and remove the accumulated sweat, body oils, and allergen residues that build up over months of use. Strip the bedding, vacuum, treat any stains, apply baking soda generously, let it sit for at least an hour (longer is better), vacuum it off, and remake with fresh bedding. Done every three to six months, this routine keeps your sleep environment genuinely fresh.
For more comprehensive mattress care, see our full guide on How to Clean a Mattress for foam, memory foam, and air mattress cleaning techniques. And to protect your clean mattress, our article on How to Clean a Sofa covers upholstery care for the rest of your bedroom furniture.
