There’s nothing more frustrating than pulling your seasonal clothes from storage, only to be met with a stale, musty smell. That unpleasant odor is a tell-tale sign that moisture has been at work, creating the perfect home for mildew.
The Science of the Musty Smell
That distinct, earthy
odor on clothes is caused by mildew, a type of fungus that thrives in damp, dark, and poorly ventilated spaces. These microscopic organisms feed on natural fibers like cotton and even tiny bits of dirt or body oils left on fabrics. When clothes are stored with even a minuscule amount of moisture, these microbes multiply and release gases called microbial volatile organic compounds (mVOCs), which are responsible for the musty smell. Essentially, what you're smelling is the byproduct of fungal growth. It doesn't take much; a slightly humid basement or clothes that felt dry to the touch but weren't can be enough to start the process.
Start with a Truly Clean Slate
Prevention starts before your clothes even see the inside of a storage box. It's crucial to wash or dry-clean everything before packing it away, even if items seem clean. Invisible sweat, body oils, and microscopic food stains can act as a food source for mildew spores. When washing, be careful not to overload the machine, as this prevents clothes from getting properly cleaned and rinsed. Using too much detergent can also leave behind a residue that traps both moisture and odors. For items that already have a faint musty smell, adding a cup of white vinegar to the rinse cycle can help neutralize odors and kill any lurking mildew.
Master the Art of 'Bone Dry'
The single most critical step is ensuring every single item is completely, totally, 'bone dry' before it's stored. Clothes can be deceptive, often feeling dry on the surface while retaining moisture deep in thick seams, waistbands, and cuffs. To ensure everything is thoroughly dry, consider a few extra steps. If using a machine, don't overload the dryer, as clothes need space to tumble and for air to circulate. Adding wool dryer balls can help separate items and speed up drying time. For heavier garments like jeans or sweaters, it’s a good idea to let them air out for several hours after the dryer cycle finishes just to be absolutely sure no dampness remains.
Choose Your Storage Location Wisely
Where you store your clothes is just as important as how you prepare them. Avoid areas prone to humidity and temperature fluctuations, such as basements, attics, or garages. These environments are ideal breeding grounds for mold and mildew. The best location is a cool, dark, and dry space with stable temperatures, like a spare closet in your main living area. Ensure there's some airflow in the space; even opening the closet door periodically can help. Avoid pushing storage containers directly against cold exterior walls, which can be prone to condensation.
Select the Right Containers
While it might seem logical to seal clothes in airtight plastic bins to keep pests out, this can also trap any residual moisture, creating a terrarium for mildew. For longterm storage, breathable containers are often a better choice. Think fabric storage bags, cotton bins, or acidfree archival boxes. If you do use plastic containers, make sure the clothes inside are impeccably dry. For added protection, you can add moisture absorbers like silica gel packets—the kind you find in new shoe boxes—or activated charcoal pouches to help capture any ambient humidity. Avoid vacuumsealed bags for natural fibers, as they compress the fabric and can trap moisture.
