Grandma Knows: How to Remove Mold Smell from Clothes

There is a particular kind of disappointment that comes with pulling a jacket out of the back of the closet, or unfolding a pile of towels left in the laundry room too long, only to be hit with that unmistakable damp, musty smell. It clings to the fabric. It does not wash out easily with a standard rinse. And it tends to come back, even after the clothes seem dry.

That smell is not just unpleasant. It is a sign that mold or mildew spores have taken hold in the fibers of the fabric. Getting rid of it properly takes more than a quick wash cycle. It takes understanding what caused the problem and choosing the right method to address it at the source.

Why Mold Smell Develops in Fabric

Mold and mildew are fungi. They thrive in environments that combine moisture, warmth, and something organic to feed on. Fabric — especially natural fibers like cotton, linen, and wool — provides exactly the kind of surface mold needs to settle and grow.

The smell itself comes from microbial volatile organic compounds, which are gases released as mold colonies grow and break down organic material. This is why the odor is so penetrating. It is not sitting on the surface of the fabric. It is coming from activity happening deep within the fibers.

Common situations that lead to mold smell in clothes include leaving wet laundry sitting in the washing machine for too long, folding and storing clothes before they are fully dry, packing away seasonal items without enough airflow, and storing clothes in a basement, closet, or drawer where humidity stays high. Even a brief period of dampness in the right conditions is enough for mold to start developing.

Understanding this helps explain why simply rewashing the clothes on a regular cycle often does not fully solve the problem. Standard laundry detergent is formulated to lift dirt and oils. Mold requires something that can disrupt the fungal growth itself and neutralize the compounds causing the odor.

White Vinegar: The Most Reliable First Step

White distilled vinegar is one of the most effective household solutions for mold smell in fabric, and it works for a straightforward reason. Vinegar is acidic, with a pH around 2.5. Mold thrives in neutral to slightly acidic environments, but concentrated acetic acid disrupts the cellular structure of mold and mildew, killing a significant portion of what is present and breaking down the compounds responsible for the odor.

The method is simple but requires attention to detail to be effective.

Fill the washing machine with warm water before adding the clothes. Add one to two cups of plain white distilled vinegar directly to the drum or to the detergent tray. Do not add laundry detergent at this stage. The vinegar needs to work without being diluted or neutralized by detergent.

Allow the clothes to soak in the vinegar solution for at least thirty minutes before running the wash cycle. If your machine has a soak function, use it. If not, pause the cycle once the drum is full and let the clothes sit before continuing.

After the cycle finishes, smell the clothes before moving them to the dryer. If the musty odor has faded significantly, the vinegar has done its job. If the smell is still noticeable, repeat the vinegar soak before drying. Putting clothes in the dryer while the smell is still present can set it further into the fibers, making it harder to remove later.

One practical note: do not worry about the vinegar smell. It dissipates completely as the fabric dries. Clothes washed in vinegar do not come out smelling like vinegar.

Baking Soda: Working Alongside Vinegar or Alone

Baking soda approaches the problem from a different angle. Where vinegar is acidic, baking soda is alkaline, with a pH around 8.3. Rather than killing mold directly, baking soda works primarily as an odor absorber. It neutralizes the acidic volatile compounds that carry the musty smell, and it has a mild abrasive quality that can help lift residue from fibers during washing.

Baking soda works well as a follow-up treatment after vinegar, or as a standalone option for clothes where the mold smell is mild and the mold growth is not extensive.

For a standalone treatment, add half a cup of baking soda directly to the drum of the washing machine along with a small amount of regular laundry detergent. Wash on the warmest setting the fabric can safely handle. The combination of baking soda, detergent, and heat addresses both the remaining mold and the odor in one step.

For a combined approach after using vinegar, run a second wash cycle with baking soda and detergent. This is especially useful for heavily affected items or for clothes that have had the smell for a long time. The two-cycle method — vinegar first, then baking soda — covers both the fungal growth and the lingering odor compounds thoroughly.

The Role of Temperature in Removing Mold Smell

Temperature matters more than most people realize when dealing with mold in fabric. Mold spores begin to die at temperatures above 140 degrees Fahrenheit (60 degrees Celsius). Washing clothes in hot water, when the fabric allows it, significantly improves results compared to a cold or warm wash alone.

Check the care label before using hot water. Cotton items, towels, bed linens, and most synthetic workout clothes can usually handle a hot wash. Wool, delicate fabrics, and items with specific cold-wash instructions should not be washed in hot water, as this can cause shrinking or damage to the fibers.

For items that cannot tolerate high heat in the wash, the drying phase becomes especially important. A full cycle in a hot dryer — again, only where the fabric allows it — helps finish what the wash started. The extended heat in the dryer adds another layer of protection against any remaining spores.

For delicate items, sunlight is a valuable alternative. UV rays from direct sunlight have a natural sanitizing effect on fabric and help break down the odor compounds. Hanging clothes outside on a dry, sunny day after washing is a straightforward way to treat delicate items that cannot go through a hot wash or dryer cycle.

Soaking Before Washing: When It Makes a Difference

For clothes where the mold smell is deeply embedded — items that have been stored in a damp space for weeks or months, or laundry that sat wet for an extended period — a pre-soak before machine washing makes a real difference.

Fill a basin or bathtub with warm water and add one cup of white vinegar. Submerge the affected clothes completely and let them soak for one to two hours. This gives the vinegar time to penetrate the fibers more thoroughly than a standard wash cycle allows.

After soaking, wring out the excess water and transfer the clothes to the washing machine. Wash as normal, adding either baking soda or a small amount of vinegar to the wash cycle as well.

An alternative soaking solution uses borax, a naturally occurring mineral compound that has long been used in household cleaning. Dissolve half a cup of borax in hot water until fully dissolved, then add it to a basin of warm water with the affected clothes. Borax raises the pH of the water, creating an inhospitable environment for mold, and it helps loosen residue from the fabric fibers. Soak for one to two hours before washing as usual.

Borax is particularly useful for towels and cotton items with persistent mold smell that has not fully responded to vinegar treatment alone.

Treating Specific Situations

Clothes Left in the Washing Machine Overnight

This is one of the most common causes of mold smell in otherwise clean laundry. Wet clothes sitting in a closed, warm machine create ideal conditions for mildew to develop within a few hours. The smell can develop surprisingly quickly — sometimes within twelve to sixteen hours in warm weather.

Rewashing immediately with vinegar is the most reliable fix. Add one cup of white vinegar to the drum with no detergent and run a full warm cycle. Follow with a normal wash cycle with detergent and baking soda, then dry the clothes promptly and completely.

The key going forward is to transfer laundry to the dryer or clothesline as soon as the wash cycle ends. Leaving the washing machine door slightly open between uses also helps reduce the moisture buildup inside the drum that contributes to this problem.

Seasonal Clothes Stored in a Damp Space

Clothes that have been packed away in a basement, garage, or poorly ventilated storage area often develop a mold smell over time, even if they were dry when stored. The ambient humidity in the space gradually penetrates the fabric.

Before storing seasonal clothes again after washing, make sure they are completely dry — not just surface dry, but dry all the way through thicker items like sweaters and jeans. Storing items in breathable cotton bags rather than sealed plastic bins helps prevent moisture from becoming trapped. Adding a small pouch of silica gel or a piece of chalk to the storage container absorbs excess moisture over time.

Wool and Delicate Fabrics

Wool and delicate fabrics require a gentler approach. Hot water and high dryer heat are not options, and prolonged soaking can damage the fibers or cause shrinking.

For these items, dilute white vinegar with an equal part of water and gently work the solution into the affected areas by hand. Allow the item to sit for fifteen to twenty minutes, then rinse with cool water and press — do not wring — to remove excess moisture. Lay flat to dry in a well-ventilated area or outdoors in indirect sunlight.

If the smell persists after this treatment, a specialist dry cleaner with experience in wool and delicate fabrics is the appropriate next step.

When Home Methods Are Not Enough

There are situations where household cleaning methods are unlikely to fully resolve the problem. If visible mold — actual dark spots or fuzzy growth — is present on the fabric, the item has likely been affected more deeply than surface-level treatment can address. Significant visible mold growth on fabric, especially on items like upholstered clothing or structured garments with internal padding, may mean the item needs professional cleaning or, in some cases, should be discarded.

Clothes with a persistent mold smell that returns after two or three rounds of vinegar and baking soda treatment may have mold growth that has penetrated deeply into thicker layers of the fabric, such as the batting inside a quilted jacket or the lining of a coat. These situations benefit from professional assessment.

It is also worth checking the storage environment itself. If clothes continue to develop mold smell after washing, the problem may be in the closet, drawer, or storage space rather than the clothes themselves. A consistently damp environment will reintroduce mold to freshly washed items. Improving ventilation, addressing any water leaks, and using a dehumidifier in problem areas resolves the root cause rather than treating the symptoms repeatedly.

Drying Clothes Properly: The Step That Gets Overlooked

All of the washing methods in the world will not prevent mold smell from returning if clothes are not dried thoroughly before being folded and stored. This is the step that is most often rushed, and it is the most common reason the problem comes back.

Clothes that feel dry to the touch on the outside may still hold moisture in thicker areas — along seams, inside collars, at the waistband of jeans, or in the layers of a folded hem. Give clothes extra time in the dryer, or hang them in a well-aired space for several hours after they come out feeling dry.

Avoid folding and putting clothes away while they are still slightly cool or damp. That small amount of remaining moisture, once enclosed in a drawer or closet, is enough to start the cycle again. When in doubt, hang the item for another hour before storing it. That small habit, done consistently, prevents most mold smell problems from developing in the first place.