The short answer
Identify the Source
A musty smell in a bed usually comes from moisture trapped in the mattress, box spring, or bedding. Sweat, spills, or high humidity can soak into the layers and create a perfect spot for mold and mildew to grow. Check the mattress for visible stains, damp spots, or a sour odor that gets stronger when you press on it.
If the smell is strong, the moisture may have reached the inner foam or springs. In that case, surface cleaning might not be enough. You may need to dry the mattress thoroughly and, if the damage is deep, consider replacing it. For now, focus on removing the smell with the steps below.
- Strip all sheets, pillowcases, and mattress pads
- Inspect the mattress for stains or damp areas
- Check the bed frame and box spring for moisture
- Look under the bed for leaks or spills
- Feel the mattress for any cold or damp zones
Wash Bedding in Hot Water
Wash all removable bedding in the hottest water the fabric allows. Add one cup of white vinegar to the wash cycle to kill odor-causing bacteria and mildew. If the care label permits, use a bleach alternative or a laundry additive designed for sports gear, which breaks down oils and sweat.
Dry everything on high heat if the fabric can handle it. Heat helps kill mold spores and removes lingering smells. If the bedding is still musty after one wash, repeat the process with a second rinse cycle. Do not put damp bedding back on the bed, as it will reintroduce moisture.
Vacuum and Deodorize the Mattress
Use a vacuum with an upholstery attachment to go over the entire mattress surface, including the sides and seams. This pulls up dust, skin flakes, and mold spores that contribute to the smell. Pay extra attention to creases and tufts where moisture collects.
After vacuuming, sprinkle a generous layer of baking soda over the mattress. Let it sit for at least six hours, or overnight if possible. The baking soda absorbs odors and moisture. Then vacuum it off thoroughly. For a stronger treatment, mix the baking soda with a few drops of essential oil like tea tree, which has natural antifungal properties.
Dry in Sunlight and Use a Dehumidifier
If the weather is dry and sunny, move the mattress outside to a clean, flat surface. Ultraviolet light from the sun kills mold and mildew, and the breeze helps evaporate trapped moisture. Leave it for several hours, flipping it halfway through. Bring it inside before evening dew sets in.
Inside, run a dehumidifier in the bedroom to lower humidity levels. Aim for a relative humidity below 50 percent. This prevents moisture from re-accumulating in the mattress. If you live in Rogers, running a dehumidifier during humid months can make a noticeable difference in keeping your bed dry.
- Place mattress in direct sunlight for 4 to 6 hours
- Flip mattress halfway through drying
- Set dehumidifier to below 50 percent humidity
- Keep bedroom windows open for airflow
- Use a fan to circulate air around the bed
- Repeat baking soda treatment if smell persists
When to Call in the Pros
If the smell remains after thorough cleaning and drying, the moisture may be deep inside the mattress or in the surrounding structure. Local water damage pros have equipment for structural drying and dehumidification that can reach into areas you cannot. They can also check for hidden leaks behind walls or under the floor that keep the bed damp.
Professional treatment often involves deep extraction, drying, and sometimes mold remediation. The cost depends on the extent of the damage and the size of the affected area. Policies vary, and your insurer decides what is covered. If you suspect a leak, have a plumber inspect the pipes before the pros start work.
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Call Now (479) 370-1500Frequently asked questions
Can I use bleach on my mattress to remove the smell?
Bleach can damage mattress fibers and leave a strong chemical smell. It is not recommended for most mattresses. Instead, use baking soda, vinegar, or an enzyme cleaner designed for upholstery. Always test any cleaner on a small, hidden area first and let the mattress dry completely.
How long does it take to get rid of the musty smell?
The time depends on how deep the moisture has soaked in. Surface smells may lift within a day after washing and baking soda treatment. If the mattress core is wet, it can take several days of drying with a dehumidifier or professional equipment. Patience is key to avoid trapping moisture.
Is a musty bed a health risk?
Mold and mildew in a mattress can trigger allergies, asthma, or respiratory irritation, especially during sleep. If you feel unwell, see a doctor. For most people, removing the smell and drying the bed reduces the risk. If mold is widespread, consider replacing the mattress or consulting a mold professional.