How to Use Mothballs: 12 Steps

Quick Reality Check: What Mothballs Are (and Aren’t)

Let’s start with the key truth: mothballs are pesticides. They work by releasing fumes that build up to levels that kill fabric pests (like clothes moths) inside a closed space. That means mothballs are designed for sealed, airtight storagenot open closets, not dresser drawers that “sorta close,” and definitely not scattered around the attic like you’re seasoning a casserole.

What’s inside: naphthalene vs. paradichlorobenzene

In the U.S., mothballs typically contain one of two active ingredients: naphthalene or paradichlorobenzene (often shortened to PDB). Both slowly turn from a solid into a gas (that classic mothball smell) and those vapors do the heavy liftingkilling moths and larvae in a tightly enclosed space.

Because these fumes are the point, letting them leak into living spaces is not a “bonus feature.” It’s a safety problem.

What mothballs are NOT for

• Not a general deodorizer for closets, basements, or storage rooms
• Not a snake repellent, rodent repellent, bat repellent, or “keep critters away” hack
• Not an outdoor pesticide (yard, garden, crawlspace vents, shed cornersnope)
• Not safe “air fresheners” (if your nose is burning, that’s not freshness; that’s your body protesting)

Safety First: The Non-Negotiables

Before we get into the step-by-step, here’s the safety baseline. If any of these are deal-breakers for your situation (kids, pets, small space, poor ventilation), skip mothballs and jump to the alternatives section.

Essential safety rules for using mothballs

• Use only as the label directs. Pesticide labels aren’t “suggestions”; they’re legal instructions.
• Only use in sealed, airtight containers (or approved airtight garment bags). The fumes must stay inside.
• Keep away from children and pets. Mothballs can be mistaken for candy or toysand ingestion is dangerous.
• Do not breathe the vapors in living spaces. If you can smell mothballs in your home, the vapors are escaping.
• Never mix products. Don’t combine naphthalene and PDB products, and don’t “double up” thinking it’s extra protection.
• Know the emergency number: In the U.S., Poison Control is 1-800-222-1222 (or online support).

If someone (or a pet) might have swallowed a mothball, or if someone feels sick from fumes, treat it as urgent. Don’t “wait and see.” The smart move is to contact Poison Control (and a veterinarian for pets).

Before You Start: Confirm You Actually Have Fabric Pests

Mothballs are meant for fabric pestsprimarily clothes moths that feed on natural fibers (wool, cashmere, felt, fur, feathers, and sometimes blended fabrics). If you’re seeing holes in cotton T-shirts, odds are good the culprit is something else (like rough washing, snags, or a belt buckle in the dryer playing demolition derby).

Signs clothes moths are the real problem

• Irregular holes in wool or natural-fiber garments
• Silky webbing or tiny cases (some species leave little “portable sleeping bags”)
• Damage concentrated in dark, undisturbed areas (back of closets, stored blankets)
• Adult moths fluttering slowly near stored textiles (not the fast “pantry moth” chaos in your kitchen)

If you’re unsure, monitoring with moth pheromone traps can help you confirm activityespecially in closets or storage areas.

How to Use Mothballs: 12 Steps

Step 1: Read the label like it’s a recipe you can’t improvise

Start with the product label. It will tell you the approved uses, the type of container, and the amount to use for a given volume (often listed in cubic feet). This is where you learn what “airtight” means for that specific product and how to handle it safely.

Step 2: Pick the right product (and don’t mix types)

Buy mothballs (or moth crystals) that are clearly labeled for fabric pests and have an intact U.S. label. Choose one product and stick with itdo not combine mothballs with different active ingredients. Mixing products doesn’t create “super protection”; it creates “super fumes.”

Step 3: Choose an airtight container that actually seals

Your container is the whole strategy. Good options include rigid plastic bins with a gasket seal, tightly sealed storage trunks, or containers specifically designed to close airtight. Some garment bags are approved for this use, but they must seal tightly.

Avoid flimsy trash bags, loosely tied plastic bags, or cardboard boxes. If you can smell mothballs outside the container, it’s not airtight enough.

Step 4: Clean everything before storage (moths love “snack stains”)

Clothes moth larvae prefer natural fibersespecially when there’s a little food, sweat, oils, or pet hair mixed in. Wash, dry clean, or thoroughly clean items before packing. Clean items are less attractive and you’re not sealing in stains that become “larva tapas.”

Step 5: Dry items completely

Store only fully dry clothing and textiles. Moisture can encourage mildew, odors, and other issues that make storage a mess. If you’re packing seasonal sweaters, let them air-dry completely after washing, and only store when there’s no dampness left.

Step 6: Add a physical barrier so mothballs don’t touch fabrics

Direct contact can damage some materials, discolor fabrics, or leave stubborn odor in certain items. Use the method recommended on the labeloften placing mothballs in a small breathable pouch, paper wrapper, or a designated spot inside the container where they won’t rest directly on your favorite sweater.

Step 7: Measure the amount based on container volume

Follow the label’s dose based on the size of the sealed space. Using more than directed is not “more effective” in any responsible senseit can increase odor problems and exposure risk. Using less than directed may not build enough vapor concentration to be effective.

Step 8: Pack items with a little breathing room (then seal tightly)

Don’t cram everything into a bin like you’re trying to win a suitcase challenge. Overpacking can reduce air space and may interfere with how vapors distribute within the container. Pack neatly, then seal the container tightly so the fumigant stays inside.

Step 9: Label the container clearly

Put a label on the outside: “Contains mothballs” plus the date packed. This prevents someone from opening it in the living room and accidentally unleashing a chemical surprise during movie night.

Step 10: Store containers in a smart location

Keep sealed containers in a cool, dry place where they won’t be punctured or cracked. Avoid placing them near heat sources that could increase vapor release or degrade the container seal. And store them where kids and pets can’t access themespecially curious pets that treat “mystery smells” like a scavenger hunt.

Step 11: When reopening, ventilate like you mean it

Open the container outdoors or in a well-ventilated area (garage with doors open, for example). Remove items and let them air out. If odor lingers, wash or dry clean according to the fabric’s care label and allow extra airing time.

Step 12: Dispose of unused mothballs safely

Don’t toss mothballs loosely into a household trash can inside your home, and never scatter them outdoors. Follow the product label for disposal guidance. If you have leftovers you can’t use according to the label, check local household hazardous waste options. Treat them like the pesticide they are.

Common Mistakes (a.k.a. How People Accidentally Create a “Mothball House”)

Using mothballs in open closets or drawers

This is the classic mistake. Mothballs must be in an airtight space for the fumes to build to a level that kills pests. In an open closet, the fumes drift into your home insteadwhere they can irritate eyes and airways and still fail at proper moth control.

Trying to repel snakes, rodents, bats, or “everything outside”

Mothballs are frequently misused as a general animal repellent. That’s not what they’re registered for, and using pesticides off-label can be illegal and harmful. Plus, wildlife and pets can be poisoned by contact or ingestion.

“More is better” dosing

Overuse raises exposure risk and odor problems without magically upgrading effectiveness. The label rate exists for a reasonstick to it.

Loose storage around kids or pets

Even one mothball can be dangerous if swallowed. Never leave mothballs in reachable places, and never store them in containers that look like candy jars (yes, that happens).

Smarter (and Often Safer) Alternatives to Mothballs

If you want fewer chemicals in your lifeor you simply don’t have a safe airtight-storage setupthere are effective ways to manage clothes moths that focus on prevention and targeted control.

1) Clean, vacuum, and reduce lint “buffets”

Regular vacuuming along baseboards, closet edges, under furniture, and inside storage areas removes lint, hair, and eggs. Wash or dry clean items before long storage.

2) Freeze or heat-treat when appropriate

Many pest management resources recommend freezing infested fabrics (sealed in bags) for several days to kill eggs and larvae, or using controlled heat treatments for certain items. These methods can be very effective when done properly and safely for the fabric type.

3) Use pheromone traps for monitoring

Clothes moth pheromone traps can help you detect and track adult moth activity. They’re especially useful as an early-warning system so you can respond before larvae turn your sweater into Swiss cheese.

4) Airtight storage without pesticides

Clean items stored in truly airtight bins can prevent moth access in the first place. This is the “no drama” option: moths can’t eat what they can’t reach.

5) Cedar and natural repellents (with realistic expectations)

Cedar products and other natural options may help deter moth activity for some people, but they generally don’t replace sanitation and airtight storage. Think of them as supporting actors, not the main character.

FAQ: Quick Answers People Actually Search For

Do mothballs work if I put them around the closet?

Not the way they’re intended. Mothballs are designed for airtight containers so fumes build up inside. In open spaces, vapors can drift into your home, increasing exposure risk and often providing poor pest control.

How do I get rid of mothball smell in clothes?

Start with fresh airoutdoors if possible. Then wash or dry clean according to the garment’s care label. Stubborn odors often fade with repeated airing and cleaning. Avoid masking the smell with heavy fragrances; that’s just “perfume + mothball,” which no one asked for.

Are mothballs safe around babies or pets?

They pose real risks if fumes escape or if a mothball is touched or swallowed. If you have babies, toddlers, or pets who can access storage areas, consider non-chemical alternatives and airtight storage without pesticides.

Is it okay to use mothballs outdoors to keep animals away?

No. Outdoor/off-label use can be harmful and may violate pesticide label requirements. Use wildlife-safe, approved deterrent methods instead.

Conclusion: Use Mothballs Like a Pro (Not Like a Ghost Story)

If you remember only one thing, make it this: mothballs belong in airtight containers, used exactly as the label directs. That’s how you keep the fumes where they work (inside sealed storage) and out of the air you breathe.

For many homes, the best moth control plan is a simple trio: clean items, airtight storage, and monitoring (with traps if needed). Mothballs can be a useful tool, but they’re not the only tooland they shouldn’t be used casually.

Real-World Experiences & Lessons Learned (The “I Wish Someone Told Me This” Section)

People don’t usually go looking for a guide on how to use mothballs until something has already gone sideways: mysterious holes in sweaters, a closet that smells like a chemical time machine, or a frantic “What did my dog just eat?” moment. Below are common real-life scenarios and the practical takeaways that come up again and again.

1) The “Open Closet Shortcut” That Backfires

A lot of folks assume mothballs are like potpourri for pest control: toss a few in the closet corners and call it a day. What typically happens is the odor spreads through the home, the closet still isn’t properly protected, and everyone becomes painfully aware that mothballs are not aromatherapy. The lesson: if it isn’t airtight, it isn’t the right setup. When people switch to sealed bins (even without mothballs), they often see fewer issues because moths simply can’t access the fabric.

2) “I Stored It Clean… I Think” (Spoiler: It Wasn’t Clean)

Clothes moth larvae love natural fibers, but they love them even more when there’s food, sweat, body oils, or pet hair. A common experience is someone storing a wool coat after a seasononly to discover damage months later. The coat wasn’t visibly dirty, but “not dirty” isn’t the same as “clean to a moth.” The takeaway: laundering or dry cleaning before storage matters, and vacuuming closets (especially edges and cracks) reduces the invisible fluff buffet.

3) The Container That “Sealed” Until It Didn’t

Another frequent story: a storage bin that seemed fine… until it cracked in a hot attic, the lid warped, or the seal loosened. That’s when odor leaks begin, and now the home smells like mothballs plus regret. The practical fix is choosing sturdy containers designed for storage, avoiding extreme heat, and labeling bins so no one opens them in a small bedroom and takes a full lungful of fumes. People who store sealed bins in a stable, cool area (rather than a sweltering attic) tend to have fewer odor surprises.

4) Pets Are Fast, Curious, and Horrible at Risk Assessment

Reports of pet exposure are heartbreakingly common: a dog finds an old mothball in a box, a cat bats one under a couch, or a pet chews a container left within reach. The learning here is simple and strict: if you have pets, mothball storage must be truly inaccessibleor mothballs shouldn’t be used at all. Airtight storage without pesticides, plus cleaning and monitoring, is often the safer route in pet households.

5) The “Snake Repellent” Myth That Won’t Die

People sometimes hear that mothballs repel snakes or rodents and try them in garages, sheds, or yards. The result is usually disappointment (the animal problem remains) plus new problems (chemical exposure and environmental risk). The better lesson: use approved, species-appropriate methodsexclusion (sealing entry points), habitat reduction, secure food storage, and professional help when needed. Mothballs are for fabric pests in sealed storage, end of story.

6) The Best Outcome Story: “I Stopped Needing Them”

One of the most positive patterns is when people shift their focus from “fumigate everything” to “make the home unfriendly to moths.” That often looks like: cleaning garments before storage, rotating and wearing natural-fiber items (moths prefer undisturbed textiles), vacuuming closet edges, controlling humidity, and storing special items in airtight bins. In many cases, once those habits are in place, mothballs become a last resort instead of a routine. It’s less smell, less risk, and fewer holes in your favorite sweaterwhich is really the whole dream.