How to remove mold from a leather jacket (white spots, mildew and spew)

Short answer: take the jacket outside, let it dry fully, brush the mold off gently and vacuum it with a HEPA vacuum, then wipe the leather with a barely damp cloth and dry it at room temperature. Wear an N95 mask and gloves while you do it. But first check that the white spots really are mold: a waxy white haze is often harmless “spew” from the leather’s own oils, which needs no cleaning at all.

Mold (or mould, in British English) grows on leather when it sits in damp air for weeks, typically in a closet against an outside wall, in a basement or in a plastic garment bag. Below: how to tell mold from spew and salt marks, a six-step cleaning method based on museum-conservation advice, what to do for suede, shearling and the lining, when a jacket isn’t worth saving, and how to store it so the mold doesn’t come back.

Is it mold, spew or salt? Check before you clean

Three different things leave white marks on a leather jacket, and only one of them is mold.

	Mold	Fatty spew (bloom)	Salt marks
Looks like	Fuzzy or powdery spots, white, green, grey or black, often in clusters	A waxy or greasy white-grey haze, fairly even across a panel	Wavy “tide lines” or a crystalline crust
Where	Seams, folds, under the collar, the lining, the side against a wall	Smooth leather surfaces, often after the jacket has been cold	Lower sleeves, hem, areas that got wet (rain, snow, sweat)
Smell	Musty, earthy, sour	None	None
Gentle warmth test	Stays the same	Melts and disappears for a while	Stays the same
What to do	Clean it as below	Buff off with a soft cloth; see a leather specialist if it keeps returning	Wipe with a barely damp cloth; see our rain guide

The warmth test: blow a hair dryer on a low, warm setting over one small spot from about 30 cm (12 in) away for a few seconds. Leather Dictionary, a leather-care reference, notes that fat or wax deposits melt and vanish temporarily, while mold stays unchanged. Don’t heat the leather more than that; heat is bad for leather.

Fatty spew is fat from the tanning process, or from too much conditioner, migrating to the surface. The Canadian Conservation Institute (CCI) notes that fatty blooms look slightly waxy and salts look crystalline, and that both are easy to mistake for mold.

Why leather jackets go moldy

Mold spores are everywhere. They only grow when the air stays damp for long enough, and leather, which is an organic material that holds oils and moisture, gives them something to feed on.

According to CCI’s note on removing mold from leather, mold can grow anywhere between 65% and 100% relative humidity (RH). How fast depends on how damp it is:

Relative humidity around the jacket	Roughly how long before mold can appear
90–100%	About 2 days
80%	About 10 days
70%	About 100 days
Below 65%	Mold growth is unlikely

That’s why mold shows up after a whole summer in a closet, a basement or a car trunk, and why a jacket put away damp after a rainy day is the most at risk. Plastic covers make it worse: they trap moisture right against the leather.

Before you start: protect yourself

Mold spores can trigger allergies and asthma, and brushing releases them into the air. The US Centers for Disease Control and Prevention (CDC) recommends these precautions when cleaning mold:

• an N95 respirator (in Australia and New Zealand, a P2 mask is the equivalent), not a cloth mask;
• gloves (CDC suggests non-latex);
• goggles without vent holes, so spores don’t reach your eyes;
• working outdoors, away from open windows and other people.

Don’t do it yourself if you have asthma, allergies, a lung condition or a weakened immune system. Ask someone else, or take the jacket straight to a leather cleaner.

How to remove mold from a leather jacket: 6 steps

This method follows CCI’s conservation advice for leather objects: dry the mold first, remove it physically, and use as little liquid as possible.

1. Bag it to move it. Put the jacket in a bag to carry it outside, so spores don’t spread through your home. Wash the bag or throw it away afterwards.
2. Dry it outdoors, in the shade. Hang it on a wide hanger outside on a dry day for a few hours. Dry mold is easier to remove and releases fewer stains. Avoid direct sun and never use a heater or tumble dryer.
3. Brush it off. With a soft brush (an old soft clothes brush or a soft paintbrush), flick the mold off the surface, working away from you and downwind. Open the pockets and check seams, the collar and the underside of the cuffs.
4. Vacuum it twice. Use a vacuum with a HEPA filter on low suction, with the brush attachment. CCI suggests two passes, the second at right angles to the first. Empty the vacuum outdoors into a sealed bag.
5. Wipe the leather. Wipe the surface with a soft cloth that is barely damp, then dry it with a clean cloth. For stubborn marks on smooth leather, use a leather cleaner. If you use white vinegar, dilute it (equal parts water is a common household mix, not a lab standard) and test it on a hidden spot first. Leather Dictionary reports that both vinegar and isopropyl alcohol killed mold in its tests, but warns that alcohol can dissolve leather’s colour coating, so we don’t recommend alcohol on the outside of a jacket.
6. Dry, then condition. Let it dry for a day at room temperature on a wide hanger, away from radiators and sun. Once fully dry, apply a thin coat of leather conditioner if the leather feels stiff (smooth leather only; see the care guide).

Leave the jacket out in fresh air for another day or two before you put it back. If the musty smell lingers, use the airing and absorbing plan in how to get the smell out of a leather jacket.

What not to use

• Bleach. It discolours and damages leather. CCI suggests a 1:10 bleach solution only for disinfecting tools and hard surfaces, never the object itself. And never mix bleach with ammonia or other cleaners: CDC warns the fumes are dangerous.
• Soaking or washing. A machine or tub wash spreads the problem and strips the leather’s oils (see can you wash a leather jacket?).
• Heat to “kill” mold. Heat shrinks and cracks leather long before it helps.
• Ozone machines. They can damage leather and aren’t safe to use in occupied rooms; our smell guide explains why.
• Perfume or air freshener. They hide the smell for a day; the mold keeps growing.

Suede, shearling and the lining

Part	What to do
Suede or nubuck outer	Dry, brush with a suede brush, vacuum (HEPA). Skip liquids; use a suede eraser on light marks.
Shearling, wool side	Dry outdoors, brush the wool with a wide-tooth comb or wire brush, vacuum. Mold deep in the wool needs a sheepskin specialist.
Shearling, outer side	Treat as suede or smooth leather, depending on the finish (what is shearling? explains the finishes).
Fabric lining	Brush and vacuum, then spot-clean with a barely damp cloth. Let it dry with the jacket turned inside out.
Quilted or padded lining	Mold inside the padding can’t be reached at home: take it to a leather cleaner.

When a moldy jacket isn’t worth saving

Most surface mold comes off. These signs mean it has gone deeper:

• Black spots that stay after brushing and wiping: dark mold often grows into the leather and stains it permanently.
• A musty smell that returns within a few days of cleaning: Leather Dictionary treats this as a sign the infestation is deep.
• Mold inside padding or interlining, or the jacket was soaked (for example in a flood).
• The leather has gone brittle, cracked or sticky.

Before you give up on a jacket you love, show it to a specialist leather cleaner. If they can’t help and it will be worn near small children or anyone with breathing problems, replacing it is the safer choice.

How to stop mold coming back

CCI recommends keeping leather at a stable 45–55% RH and 18–20°C (64–68°F). Above 65% RH encourages mold; below 30% RH makes leather brittle. You don’t need a museum, just a few habits:

1. Put it away dry. After rain or snow, let the jacket dry at room temperature for a day or two first.
2. Clean it before storage. Skin oils, food and dirt give mold something to feed on.
3. Use a breathable cotton garment bag, never plastic or a vacuum bag.
4. Hang it on a wide, shaped hanger with a little space around it, not squeezed between other coats.
5. Choose the right spot. An inside wall, not an outside wall, basement, attic, garage or car trunk.
6. Check the humidity. A cheap digital hygrometer tells you whether your closet stays above 60%. If it does, run a dehumidifier in the room or move the jacket.
7. Air it out. Take it out once a month in the off-season and look at the seams and collar.

Checklist

• Confirmed it’s mold (fuzzy, musty, survives gentle warmth), not spew or salt
• N95 or P2 mask, gloves and unvented goggles on; working outdoors
• Jacket dried in the shade before cleaning
• Mold brushed off and HEPA-vacuumed twice
• Barely damp wipe; any product spot-tested first
• Dried at room temperature, then conditioned (smooth leather only)
• Stored dry, in cotton, on a wide hanger, below about 60% humidity

Frequently asked questions

Can mold be removed from a leather jacket?

Usually, yes. Surface mold can be dried, brushed and vacuumed off, then the leather wiped and conditioned. Mold that has stained the leather black, grown into padding, or keeps coming back with a musty smell may be permanent and needs a specialist’s opinion.

Why does my leather jacket have white spots?

White spots are either mold, fatty spew or salt. Mold is fuzzy and smells musty; spew is a waxy haze that melts briefly under gentle warmth; salt leaves crystalline tide lines after rain or sweat. Only mold needs the cleaning steps on this page.

Does vinegar kill mold on leather?

Leather Dictionary’s tests found vinegar kills mold, but liquid is a last step, not the first. Dry, brush and vacuum first, then use a barely damp cloth with diluted white vinegar on smooth leather only, after a spot test.

Can I use bleach on a moldy leather jacket?

No. Bleach discolours and weakens leather. Conservators use diluted bleach only to disinfect tools and hard surfaces, never the leather itself.

Is mold on a leather jacket dangerous?

It can be for some people. Mold spores can trigger allergies and asthma. Clean it outdoors with an N95 or P2 mask, gloves and goggles, and let someone else do it if you have a lung condition, allergies or a weakened immune system.

How do I stop my leather jacket going moldy in the closet?

Store it clean and fully dry in a breathable cotton bag on a wide hanger, against an inside wall, in a room that stays below about 60% relative humidity. Never store leather in plastic. More in how to store a leather jacket.

Sources checked October 2026: Canadian Conservation Institute, CCI Notes 8/1 “Removing Mould from Leather” (modified February 2020) and 8/2 “Care of Alum, Vegetable and Mineral-tanned Leather” (modified February 2019); Leather Dictionary entries “Moldy leather” and “Fatty spue: fat marks on leather”; US Centers for Disease Control and Prevention, “Mold Clean Up Guidelines and Recommendations” (reviewed February 2024); Better Health Channel (Victoria, Australia), “Mould removal at home”; Museums & Galleries of NSW, “Preservation of historic leather”.