How to Remove Mold, Mildew, and Musty Smell From Leather

Mold and mildew on leather usually appear as a white, gray, greenish, or slightly fuzzy haze that can be wiped away, at least partially, with a dry cloth. It often smells musty or sour, especially in an enclosed space like a closet or storage bin. Dried finish or bloom, on the other hand, is usually a dull, powdery, even coating without the fuzzy texture, and it does not carry the same damp smell.

If you are unsure, wipe a small area with a dry cloth outdoors. Mold and mildew typically lift into the cloth as loose particles. If the haze does not move much and the item does not smell musty, you may be dealing with dried oils or old polish residue rather than mold, which calls for a standard cleaning routine instead of a mold-specific one.

Leather is a natural material that absorbs moisture from the air, and mold spores are present almost everywhere. When leather sits in a humid, poorly ventilated space, such as a plastic storage bin, a damp basement, a closed car trunk, or a tightly packed closet, moisture gets trapped against the surface and gives mold what it needs to grow. Dust, skin oils, and old conditioner residue on the leather act as extra food for mold and mildew.

This is why mold problems often show up after a rainy season, after storing items in plastic rather than breathable fabric, or after leather goods sit unused for months. Shoes stored in a closed box, bags left in a damp closet, and jackets kept in dry cleaner plastic are common cases, since none of those environments let moisture escape.

Take the item outside or to a well-ventilated area before you start, since disturbing mold can release spores into the air. Wipe the surface first with a dry, soft cloth to remove loose mold. Then dampen a cloth, not the leather itself, with a leather-safe cleaner and wipe the affected area in small sections, turning the cloth often so you are not spreading mold back onto clean areas.

Avoid soaking the leather, using bleach, or using strong household disinfectants, since these can discolor leather, dry it out, or damage the finish. Work section by section, let each area air dry, and check whether the haze and smell are lifting before moving to the next section.

Wiping away visible mold does not always remove the smell, since odor can sit in the leather's pores and any lining or padding underneath. After cleaning, let the item air out in a dry, ventilated space away from direct sun and heat for at least a day. Stuffing bags and shoes loosely with clean paper, not newspaper, which can transfer ink, can help hold their shape and absorb residual moisture while they air out.

If the musty smell lingers, a second light cleaning pass with a leather-safe cleaner often helps, since it lifts the residue mold feeds on rather than just masking the odor. Avoid spraying strong perfumes or fabric fresheners directly onto leather, since they can leave a sticky film or an uneven finish.

Mold cleanup, especially with repeated wiping, can leave leather looking slightly dry or dull once the haze is gone. A leather care routine that includes conditioning can help restore flexibility and a healthier look. If mold has left a permanent light patch or discoloration on finished leather, a color restorer can help even out the surface once you are confident the mold itself is fully cleared.

Suede, nubuck, and sheepskin need a different approach than smooth finished leather, since they absorb moisture and mold differently. A suede-specific cleaning kit is safer than a smooth-leather cleaner for these materials, and a suede brush can help lift dried mold residue out of the nap after cleaning.

Store leather in breathable spaces such as cloth dust bags, cardboard boxes with ventilation, or open closet shelving rather than sealed plastic bins or dry cleaner plastic. Airflow is the main defense against mold, since it prevents moisture from sitting against the surface. If the storage area itself tends to be humid, a moisture absorber or a small dehumidifier nearby can help.

Check stored leather every few months, especially in humid climates or during rainy seasons. Give bags, shoes, and jackets some airflow between uses rather than leaving them untouched for long stretches, and avoid stacking damp or recently worn leather directly with dry, stored pieces.

Mold and mildew on leather look worse than they usually are. In most cases, a careful cleaning in a ventilated space, a proper airing-out period, and a follow-up conditioning step can bring the item back without permanent damage. The smell is almost always solvable once the mold itself is fully removed rather than just wiped over.

The real fix is prevention. Store leather with airflow, keep it out of damp enclosed spaces, and give it a light check every few months so a small storage issue never has the chance to turn into a full mold problem again.