Clothes moths cause damage during their larval stage, not as flying adults. The tiny, worm-like larvae feed on keratin, a protein found in animal-based fibers like wool, silk, fur, feathers, felt, and leather. Protecting your clothes means breaking the moth life cycle at every point: keeping adults from laying eggs on your garments, killing any eggs or larvae already present, and storing vulnerable items so moths can’t reach them.
What Moths Actually Eat (and Don’t)
Clothes moth larvae feed exclusively on animal fibers. Wool sweaters, cashmere scarves, silk blouses, leather jackets, and down-filled coats are all targets. Cotton and synthetic fabrics like polyester and rayon are rarely attacked unless they’re blended with wool or heavily soiled with food stains and body oils. Those stains provide extra nutrients that attract larvae even to materials they wouldn’t normally eat.
The two most common species work slightly differently. Webbing clothes moth larvae spin silken tubes or patches of webbing as they graze along fabric surfaces, creating threadbare spots where fibers are chewed at the base. They tend to feed within folds and other concealed areas. Casemaking clothes moth larvae build a small portable tube from silk and fibers of whatever they’re eating, dragging it along wherever they go. Both species leave behind tiny fecal pellets, which are often the first visible sign of an infestation.
Clean Before You Store
Moth eggs and larvae can already be on your clothes before they go into storage. Cleaning is the most important single step you can take. Laundering in water at least 120°F for 20 to 30 minutes kills all life stages, from eggs to adult moths. Most home water heaters are set to around 120°F, so a long hot wash cycle will typically hit this threshold. For delicate woolens that can’t handle hot water, dry cleaning is equally effective because the solvents destroy eggs and larvae.
Items that are neither washable nor dry-cleanable can be treated with temperature extremes. Placing a garment in a sealed plastic bag and leaving it in a freezer below 18°F for several days kills all stages. Alternatively, heating an item in an oven above 120°F for at least 30 minutes works, though this is only practical for small, heat-tolerant items like felt hats or fabric accessories. For large pieces like rugs or blankets, vigorous brushing is a useful first step. It physically destroys eggs and exposes hidden larvae to light and air, which they avoid.
Airtight Storage Is Your Best Defense
Once clothes are clean, sealing them away from moths is the most reliable long-term protection. Plastic storage bins with gasket lids or tight-fitting seals prevent adult moths from reaching your garments to lay eggs. Compression vacuum bags serve the same purpose and save space. The key is a true seal: moths are small enough to find gaps in loosely lidded containers or cardboard boxes.
If you prefer not to use plastic, breathable garment bags made from tightly woven cotton or canvas will block moths while allowing some airflow, reducing the musty smell that sealed plastic can cause over months. Some of these bags incorporate cedar panels for added repellent effect. Whichever method you choose, make sure garments are completely clean and dry before sealing them. Moisture trapped inside a container can cause mildew, trading one problem for another.
How Cedar Actually Works
Cedar is the most popular natural moth repellent, and it does more than just smell pleasant. The volatile oils in cedar, particularly compounds called cedrol and thujopsene, disrupt a moth’s nervous system. The strong scent interferes with their ability to navigate, find mates, and locate suitable egg-laying sites. Cedar also masks the smell of keratin itself, effectively hiding your wool and silk from female moths searching for a place to lay eggs.
There’s an important catch: the wood block lasts for years, but the scent fades after three to six months. Once the smell weakens, so does the protection. To refresh cedar, lightly sand the surface with fine-grit sandpaper until the red color brightens and the fragrance returns. This physically reopens the wood’s pores, releasing fresh oil from deeper in the grain. For a stronger boost, apply a few drops of cedar essential oil after sanding and let it dry completely before placing the wood back near fabrics. Skip this drying step and you risk oil stains on your clothes.
Cedar works best in enclosed spaces like drawers, storage bins, or garment bags where the scent can concentrate. In an open closet with good airflow, the volatile oils dissipate too quickly to build up to effective levels.
Pheromone Traps for Early Detection
Pheromone traps use a synthetic version of the scent female moths produce to attract males. Male moths fly toward the lure and get stuck on a sticky surface inside the trap. These traps are useful as an early warning system. They can reveal an infestation before it causes serious damage and help you pinpoint which room, closet, or storage area has the problem.
What pheromone traps won’t do is eliminate an infestation on their own. They only catch males, and a single mated female that arrived before you set the trap can still lay dozens of eggs. Think of them as a monitoring tool, not a solution. If you start catching moths regularly, that’s your signal to inspect nearby woolens, clean thoroughly, and upgrade your storage methods.
Mothballs: Effective but Risky
Traditional mothballs contain high concentrations of naphthalene or paradichlorobenzene. Both are registered insecticides that release a toxic gas, slowly building up inside a container until the fumes kill moths at every life stage. They work, but they come with real safety concerns.
Mothballs are designed to be used only in closed, airtight containers where the fumes stay trapped. Used out in the open, those same fumes are harmful to people, pets, and wildlife. They should never be placed near food or food preparation areas. The lingering chemical smell on treated clothing can be difficult to remove and unpleasant to wear. For most people, the combination of proper cleaning, airtight storage, and cedar offers effective protection without the health trade-offs.
Keeping Your Closet Hostile to Moths
Moths thrive in dark, undisturbed spaces with still air. Your everyday closet is less vulnerable than seasonal storage simply because you open it, move things around, and let in light and airflow regularly. The garments most at risk are the ones you forget about: the wool coat pushed to the back, the cashmere scarf in a drawer you haven’t opened since spring.
Vacuuming closet floors, shelves, and baseboards removes stray fibers, hair, and lint that moth larvae feed on. Pay attention to corners and crevices where debris accumulates. Rotating and inspecting stored woolens every few months catches damage early. Look for threadbare patches, small holes, silken webbing, and tiny sand-grain-sized pellets. If you spot any of these, pull the item out immediately, treat it with heat or freezing, and inspect everything stored nearby.
Keeping clothes clean even during active use matters too. Worn wool picks up body oils and food residue that make it far more attractive to egg-laying moths. If you’re not ready to launder a wool garment after every wear, brushing it before hanging it back up removes surface debris and any eggs that may have been deposited while you were out.