How to Get Rid of Mildew Smell (Closets, Clothes & Rooms)

Quick answer: To get rid of mold smell in a closet, empty it, find and fix the moisture source, clean visible mold off hard surfaces with detergent and water, and wash or dry-clean everything that smells. Then keep the closet below 50% relative humidity with airflow and a small dehumidifier or silica-gel canister. The smell only stays gone once the dampness is gone.

That musty, “old basement” smell on your jackets is a warning sign, not just an annoyance. It’s produced by mold and mildew growing somewhere in the closet, often where you can’t see it. This guide shows you how to get rid of mold smell in closet spaces for good: where it comes from, how to clean it out step by step, and the small gear that keeps it from coming back.

What causes mold smell in a closet?

Closets are the perfect mold incubator: dark, closed off, packed with fabric, and rarely aired out. Mold needs just three things to grow: moisture, food (cotton, wool, leather, wood, drywall paper, dust) and still air. A closet supplies all three.

The musty odor itself comes from microbial volatile organic compounds (MVOCs), gases that mold and mildew release as they grow. You can smell them long before you see any fuzzy spots, which is why a closet can reek while looking clean.

The most common moisture sources

• High indoor humidity. The EPA recommends keeping indoor humidity between 30% and 50%. Above about 60%, mold can grow on surfaces that never get wet at all.
• A cold exterior wall. Closets on outside walls stay cooler in winter. Warm, humid indoor air condenses on the cold drywall behind your clothes, much like condensation on windows.
• Putting away damp items. Gym clothes, wet shoes, towels, and coats hung up after rain add a surprising amount of water to a small space.
• A hidden leak. A bathroom on the other side of the wall, a roof leak, attic condensation, or plumbing in the wall can keep drywall damp for months.
• No air movement. Solid doors, overstuffed rods and boxes pushed against walls create dead-air pockets where moisture lingers.

How to get rid of mold smell in closet spaces: step by step

Plan on a free afternoon for the deep clean, plus a week or two of drying and monitoring. Work with the closet door open and a window cracked or a fan running in the room.

1. Empty the closet completely. Take out every item, including boxes, shoe racks and hangers. Sort into three piles: washable fabrics, dry-clean or delicate items, and hard goods (shoes, bags, bins). Check each item for visible spots or a strong smell.
2. Inspect for the source. With a flashlight, check corners, baseboards, the back wall, the ceiling and the floor under carpet edges. Brown or yellow water stains, peeling paint, or a spot that feels cold and clammy point to a leak or condensation. Press on suspect drywall: if it’s soft, you have a bigger problem than a closet cleanup (see the pro section below).
3. Measure the humidity. Put a digital hygrometer on a shelf, close the door, and read it after a few hours. Readings above 55–60% mean humidity is part of the cause, and you now have a baseline to beat.
4. Vacuum first. Use a vacuum with a HEPA filter to remove loose spores and dust from shelves, walls, the floor and carpet. Empty the canister or bag outside so you don’t release spores back into the house.
5. Clean hard surfaces with detergent and water. The EPA’s mold guidance recommends scrubbing mold off hard surfaces with detergent and water, then drying them completely. Use a spray bottle of warm water plus a squirt of dish soap, a scrub brush, then a clean damp cloth. For stubborn mildew, undiluted white vinegar sprayed on and left for an hour works well on painted walls and sealed wood shelves. Wipe dry when done.
6. Deal with stains on non-porous surfaces. If dark spots remain on a painted shelf or a tile floor, a diluted bleach solution can lighten them. Bleach does not reach mold rooted inside drywall or raw wood, though, so don’t count on it as a fix for porous materials.
7. Dry the closet fast. Leave the door open and aim a box fan into the closet for 24–48 hours. The goal is bone-dry surfaces before anything goes back in.
8. Wash everything that smells. Wash fabrics in the warmest water the care label allows. Add 1 cup of white vinegar to the rinse cycle, or a half cup of baking soda to the wash, to help lift odor. Dry completely, preferably in a hot dryer or outside in sunlight. Take wool and delicate items to a dry cleaner and tell them about the mildew.
9. Treat shoes, bags and leather. Wipe leather with a cloth dampened with a 50/50 mix of water and white vinegar, let it air-dry away from heat, then condition it. Sprinkle baking soda inside shoes overnight and vacuum it out. Toss anything that stays moldy or smells after two cleanings.
10. Absorb lingering odor. Set out an open box of baking soda or a bowl of activated charcoal for a week. These absorb odor molecules but don’t remove moisture, so they’re a finishing step, not the fix.
11. Put things back with breathing room. Leave space between hangers, keep items off the back wall, and use wire or slatted shelving where you can. Store off-season clothes in breathable cotton bags rather than sealed plastic, which traps moisture.

If you use bleach, mix no more than 1 cup of household bleach per gallon of water, work with a window open and a fan running, and wear rubber gloves and eye protection. Never mix bleach with ammonia, vinegar or other acidic cleaners: the combination releases toxic gases. Keep kids and pets out of the room until surfaces are dry, and follow the label. Wear an N95 mask while vacuuming or scrubbing mold, especially if you have allergies or asthma.

The equipment that helps

Cleaning removes the mold you have. A small moisture-control tool and a hygrometer stop new mold from growing. For a closet, you don’t need a big compressor dehumidifier. These are the options that fit the space. For more choices and a full comparison, see our guide to the best small dehumidifier.

If your closet is large or attached to a humid bathroom, a bigger thermoelectric unit like the BEDRED 95 oz dehumidifier holds more water between emptyings. Take the “1,000 sq ft” marketing with a grain of salt: thermoelectric units are fine for a closet or bathroom, but they don’t have the capacity for a whole room with a real moisture problem.

How to keep mold smell from coming back

Mold smell returns whenever humidity creeps back up. These habits keep your closet dry year-round.

• Keep humidity under 50%. Check your hygrometer weekly for the first month. If the closet stays above 50–55% with a mini dehumidifier running, the whole room or house needs help, and a compressor dehumidifier will do more than any closet gadget.
• Never hang damp items. Let coats, gym clothes and shoes dry fully in the open air before they go back in.
• Add airflow. Leave the door cracked a few inches, swap a solid door for a louvered one, or run a small fan for an hour a day.
• Don’t overpack. Tightly packed clothes trap humid air. Thin out what you don’t wear.
• Leave a gap from exterior walls. Pull shelves and boxes 2–3 inches away from cold outside walls so air can circulate.
• Use breathable storage. Cotton garment bags and canvas bins beat sealed plastic, which traps moisture from any item that went in slightly damp.
• Fix leaks right away. Any water stain, fresh paint bubble or new musty patch means water is getting in. Find it before the mold spreads.
• Clean twice a year. Empty the closet each spring and fall, vacuum, wipe down surfaces and check for early spots.

If the musty smell is spreading beyond the closet, the whole house may be too humid. Our complete guide to getting rid of mold and mildew covers every room, and the musty basement guide helps if the dampness starts below you.

When to call a professional

Call a licensed mold remediation company if the moldy area is larger than about 10 square feet (the EPA’s guideline for DIY cleanup), if drywall is soft, crumbling or stained from behind, if the smell comes back within weeks even after a thorough clean, if the closet shares a wall with a bathroom or plumbing that may be leaking, or if flooding or sewage was involved. See a doctor if anyone in the home has breathing problems, headaches or allergy symptoms that seem linked to the mold.

A plumber or roofer may be the right first call if you find a leak. Remediating mold without fixing the water source just means paying twice.

Frequently asked questions

Can I just use an air freshener or odor spray?

No. Air fresheners and fabric sprays only mask the smell for a few hours while the mold keeps growing. The odor comes from living mold, so it returns as soon as the fragrance fades. Remove the mold, dry the space, and control humidity. Baking soda or activated charcoal can then absorb the last traces of odor.

Does vinegar kill mold in a closet?

White vinegar works well on mildew on painted walls, sealed wood shelves and many hard surfaces. Spray it on undiluted, let it sit about an hour, then scrub and wipe dry. It won’t fix mold growing inside drywall, and it never replaces fixing the moisture. Never mix vinegar with bleach, because the combination releases toxic chlorine gas.

How do I get the musty smell out of clothes?

Wash them in the warmest water the label allows with your usual detergent, then add a cup of white vinegar to the rinse cycle. Dry completely, ideally in a hot dryer or in sunlight. Repeat once if the smell lingers. Take wool, silk and structured items to a dry cleaner and mention the mildew so they can treat it properly.

What humidity should a closet be?

Aim for 30–50% relative humidity, in line with EPA guidance for indoor air. Mold growth becomes much more likely above about 60%. Closets often run a few points higher than the room around them because air doesn’t move, so check with a hygrometer inside the closet, with the door closed, rather than relying on your thermostat’s reading.

Is mold smell in a closet dangerous?

A musty smell means mold or mildew is growing, and the EPA notes mold can trigger allergy symptoms and asthma attacks in sensitive people. A small patch cleaned promptly is usually manageable. Anyone with breathing problems or persistent symptoms should talk to a doctor, and large or recurring growth should be handled by a professional.

Do moisture absorbers work in closets?

Calcium chloride tubs and silica-gel canisters both help in small, closed closets with mild dampness. They pull modest amounts of water and work best as a maintenance tool. If you’re emptying or recharging them every few days, humidity in the room or house is too high, and a real dehumidifier is the better fix.

The bottom line: clean the mold, dry the closet, and control humidity, and the smell won’t come back. If you’re choosing a device, start with our roundup of the best small dehumidifiers for closets, bathrooms and tight spaces.