Get Rid of Musty Smell in House Naturally: 9 Methods

A musty smell is not really a smell problem. It is a moisture problem that happens to have a smell. That is why a bowl of baking soda can make a closet noticeably fresher while doing nothing at all for a basement that stays at 70 percent humidity. If you want to know how to get rid of musty smell in house naturally, the honest answer is to pair chemical-free odor absorbers with the one natural fix that actually stops the smell from coming back: drier, moving air.

Start by drying the space: open windows when outdoor air is drier, run fans, and bring indoor humidity down to 30 to 50 percent. Then absorb what lingers with baking soda and activated charcoal, wipe hard surfaces with white vinegar, and put washable items in direct sunlight. Each of the nine methods below works, but each has limits. Knowing those limits keeps you from masking a leak or hidden mold that needs real repair.

How to Get Rid of Musty Smell in House Naturally: Start With Moisture

Musty odors come from microbial volatile organic compounds released by mold and mildew growing on damp materials: drywall paper, carpet backing, wood, cardboard, fabric, and dust. When the moisture goes away, growth slows and the smell fades. When it stays, no amount of baking soda will win.

Before you try any natural remedy, pick up an inexpensive digital hygrometer, which usually costs less than a takeout lunch. Readings tell you which methods will help:

• Below 50 percent: Odors are likely lingering in materials. Absorbers, cleaning, and airing out should work.
• 50 to 60 percent: Borderline. Improve airflow and ventilation along with absorbers.
• Above 60 percent: Growth conditions. Humidity control comes first, or everything else is temporary.

Also look for obvious sources: a slow drip under a sink, condensation on a cold exterior wall, a wet crawlspace, a clogged gutter overflowing near the foundation, or a front-load washer gasket that never dries.

Method 1: Cross-Ventilation and Airflow

Stagnant air traps odor and moisture. Open windows on opposite sides of the house to create a cross-breeze, and place a box fan in one window blowing out to pull fresh air through. Do this on dry, breezy days. On humid summer days, outdoor air can add moisture, so check your hygrometer and close up if indoor readings climb.

Inside, open closet doors, pull furniture a few inches away from exterior walls, and run ceiling fans. Air movement lets damp surfaces dry and keeps pockets of stale air from forming behind couches and dressers.

What it can’t fix: Airflow helps surface dampness, but it will not dry a wet subfloor or a leak behind a wall.

Method 2: Humidity Control

Lowering humidity is the most effective natural fix because it removes the conditions mold needs. Use bathroom and kitchen exhaust fans during and for 20 minutes after showers and cooking. Vent your dryer outside. Keep lids on simmering pots. In basements and other chronically damp spaces, a dehumidifier sized for the square footage often solves the smell on its own within a week or two.

Air conditioning also dehumidifies. Keeping it running on mild humid days, rather than shutting it off, helps hold moisture down.

What it can’t fix: A dehumidifier cannot keep up with active water intrusion such as a foundation leak or plumbing drip.

Method 3: Baking Soda

Baking soda neutralizes acidic odor molecules. Set open boxes or shallow dishes in closets, cabinets, and small rooms, and replace them every one to three months. For carpet and upholstery, sprinkle a light, even layer, work it in with a soft brush, leave it for several hours or overnight, and vacuum thoroughly with a machine that has a good filter.

It is safe for most fabrics and carpets, but test an inconspicuous spot on delicate materials first.

What it can’t fix: Baking soda absorbs odor at the surface; it does not kill mold or reach smells deep in padding.

Method 4: Activated Charcoal

Activated charcoal has an enormous porous surface that traps odor molecules through adsorption. Breathable activated charcoal odor absorber bags are a handy, fragrance-free option for closets, basements, bathrooms, cars, and gym bags. Most bags can be recharged by placing them in direct sunlight for a few hours each month, and they typically last a year or two.

Charcoal generally outperforms baking soda in larger or more persistent odor situations. Use several bags per room rather than one; a common rule is one medium bag for every 50 to 90 square feet.

What it can’t fix: Charcoal traps odor already in the air but does not stop new odor from forming.

Method 5: White Vinegar

White vinegar is mildly acidic and cuts mildew film and odor on hard surfaces. Mix equal parts vinegar and water in a spray bottle for wiping walls, shelves, window sills, and tile. For stronger mildew on non-porous surfaces, use undiluted vinegar, let it sit an hour, then scrub and rinse. A bowl of vinegar left out overnight can also absorb odors in a small room.

Avoid vinegar on natural stone such as marble, limestone, and travertine, since acid etches the surface. Do not use it on unsealed wood or waxed floors. Never mix vinegar with bleach or ammonia-based products; the combination releases toxic gas. Ventilate while cleaning and wear gloves if you have sensitive skin.

What it can’t fix: Vinegar handles surface mildew but does not reliably reach growth inside porous materials like drywall.

Method 6: Sunlight

Ultraviolet light and heat help dry and freshen fabrics. Hang rugs, cushions, pillows, curtains, and bedding outside in direct sun for four to six hours on a dry day, flipping halfway. Wash what you can first in hot water with a cup of vinegar in the rinse cycle. Open blinds in musty rooms on sunny days to warm and dry surfaces.

What it can’t fix: Sunlight fades some dyes and cannot treat furniture or walls that stay indoors.

Method 7: Houseplants and Natural Absorbers

Some people add bowls of dry coffee grounds, cat litter made of clay, or rice to cupboards as short-term absorbers. These work on a small scale, much like baking soda. Houseplants add visual freshness but have only a minor effect on odor in a real home. Avoid overwatering them, since damp potting soil can grow mold and add to the problem.

What it can’t fix: These are finishing touches, not solutions.

Method 8: Deep Clean Fabrics and Soft Surfaces

Musty odor often lives in carpet, rugs, and upholstery. Vacuum slowly with a filtered vacuum, then steam clean carpets and let them dry completely within 24 hours using fans and open windows. Slow-drying carpet is a common cause of a new musty smell, so avoid over-wetting. Launder curtains and throw blankets. Empty and clean closets, discarding cardboard boxes that absorb moisture and replacing them with plastic bins.

What it can’t fix: Carpet padding that was soaked by a flood or pet accidents usually needs replacement.

Method 9: Natural Fresheners (Last, Not First)

Simmering citrus peels, cinnamon, or cloves in water, or using a few drops of essential oil in a diffuser, adds a pleasant scent. Use these only after you have dried and cleaned the space; otherwise they simply mask a problem. Keep essential oils away from cats and other pets that can be sensitive to them.

When Natural Methods Aren’t Enough

If the smell returns within days of cleaning and airing out, or your hygrometer stays above 60 percent with a dehumidifier running, look for a hidden source. Signs include staining on ceilings or baseboards, peeling paint, warped flooring, soft drywall, or visible spots of mold.

• Fix moisture first. Repair leaks, clean gutters, regrade soil so it slopes away from the foundation, and seal crawlspace vents or add a vapor barrier where appropriate.
• Small areas of surface mold under about 10 square feet on hard surfaces can usually be cleaned by a homeowner with gloves, eye protection, an N95 respirator, and good ventilation.
• Mold larger than about 10 square feet, mold inside walls or HVAC ducts, or mold after sewage or flood water calls for a professional mold remediation company.
• Anyone with asthma, allergies, or a weakened immune system should avoid disturbing mold at all.

Costs vary: dehumidifiers and hygrometers run from tens to a few hundred dollars, a plumber’s leak repair is often a few hundred, and professional mold remediation ranges from several hundred to several thousand dollars depending on the area and access.