You bought or inherited a used camper that reeks of mothballs — and now you understand why that smell has such a reputation. Naphthalene (the active ingredient in traditional mothballs) is a volatile organic compound that penetrates fabrics, upholstery, wood, and plastics deeply. The smell does not just sit on surfaces — it soaks into them. Getting it out requires a systematic approach. Here are 9 methods that actually work, along with the science behind why each one is effective.
Why Mothball Smell Is So Persistent
Mothballs work by slowly releasing naphthalene or paradichlorobenzene vapor — that is the whole point. These vapors penetrate fabric fibers, foam cushions, wood grain, and even plastic to repel moths. When the mothballs are removed, the absorbed compound slowly off-gasses back out — which is why a camper can smell like mothballs for months after the balls themselves are gone. Surface cleaning alone rarely works. You need to remove the compound from the materials themselves or accelerate its off-gassing.
9 Effective Ways to Remove Mothball Smell from a Camper
1. Air It Out Thoroughly (Start Here)
Open every window, vent, cabinet, and drawer in the camper. Park it in direct sunlight and let it air out for a full day — or several days if possible. Heat accelerates off-gassing: on a hot day, the interior of a camper in direct sun can reach 120–140°F, which dramatically speeds up the release of naphthalene vapor from surfaces. The vapor needs somewhere to go, so maximum ventilation is essential. Do not skip this step even if you plan to use other methods — airing out is always the first and most important step.
2. Remove and Wash All Soft Furnishings
Remove every washable item from the camper: curtains, cushion covers, bedding, mattress covers, rugs, towels. Wash them in hot water with 1 cup of white vinegar added to the wash cycle (in addition to regular detergent). Vinegar neutralizes naphthalene odor compounds rather than just masking them. Air dry outside in sunlight rather than using a dryer — heat from the dryer can bake remaining odor into fabric fibers. If items still smell after washing, repeat the vinegar wash before drying.
3. Wipe All Hard Surfaces with White Vinegar
Mix equal parts white vinegar and water in a spray bottle. Wipe down every hard surface: walls, countertops, cabinets (inside and out), floors, doors, and window frames. Vinegar’s acetic acid neutralizes odor compounds on contact rather than covering them with fragrance. The vinegar smell itself dissipates within 30–60 minutes as it dries, taking the mothball odor with it. Pay special attention to corners, crevices, and the insides of cabinets where mothballs were likely stored.
4. Use Activated Charcoal to Absorb Residual Odor
Place several bowls or bags of activated charcoal throughout the camper (available in large bags from Amazon, often sold for aquarium filtration). Close all windows and vents and leave the charcoal in place for 24–48 hours. Activated charcoal has an enormous surface area that physically traps and holds odor molecules including naphthalene. This works best after the initial airing-out and surface cleaning, as a cleanup step for residual background odor. Replace the charcoal every 2–4 weeks until the smell is gone.
5. Baking Soda on Cushions and Upholstery
Sprinkle a generous layer of baking soda over fabric cushions, mattresses, and any upholstered surfaces you cannot remove and wash. Leave it for at least 8 hours (overnight is ideal). The baking soda absorbs odor from the fabric surface. Vacuum thoroughly to remove all the baking soda. For deep-set mothball smell in foam cushions, repeat this process 2–3 times — the first treatment pulls surface odor, subsequent treatments reach deeper into the foam.
6. Ozone Treatment for Severe Cases
An ozone generator is the most powerful tool for eliminating deep-set odors from a camper. Ozone (O3) oxidizes odor-causing compounds at the molecular level, permanently eliminating rather than masking them. Rent or buy a small ozone generator, place it in the closed camper, run it for 2–4 hours, then ventilate thoroughly for several hours before re-entering. Important: ozone is harmful to breathe — do not remain in the camper during treatment, and do not enter until it has fully ventilated. Remove pets, plants, and rubber/latex items before treatment.
7. Coffee Grounds as a Natural Odor Absorber
Fresh or used coffee grounds placed in open bowls throughout the camper absorb odors effectively and leave a pleasant residual scent. Place bowls in cabinets, under the bed, in closets, and on countertops. Leave them in place for 2–3 days. Coffee grounds are particularly effective at absorbing the sharp chemical notes of mothball smell. This method works best as a follow-up to cleaning and airing rather than as a standalone treatment.
8. Cedar as a Long-Term Odor Neutralizer
Cedar naturally repels moths (it was the original moth repellent before chemical mothballs were invented) and also absorbs musty odors. After removing the mothball smell, place cedar blocks, cedar balls, or cedar sachets in your storage areas and closets. Sand the surface of cedar blocks lightly every few months to renew their effectiveness. Cedar does not just mask odor — it actively absorbs it from the air. It also provides ongoing moth protection so you never need mothballs again.
9. Clean HVAC and Vents
Mothball vapor circulates through the camper’s air system and accumulates in the HVAC ducts, fan blades, and vent covers. Replace the furnace filter. Remove vent covers and wash them in hot soapy water. If accessible, wipe inside duct openings with a vinegar-dampened cloth. Running the camper’s furnace or AC on high for 30–60 minutes with all windows open helps flush remaining odor from the air system. This step is often overlooked but is essential for campers where the smell persists despite surface cleaning.
How Long Does It Take to Remove Mothball Smell?
For mild cases (mothballs used briefly in a small area), thorough airing and vinegar washing may resolve the issue in 1–3 days. For severe cases (mothballs used throughout the camper for months or years), expect 2–6 weeks of repeated treatments. The combination of airing, vinegar washing, activated charcoal, and baking soda treatments used consistently is more effective than any single method used once. Persistence pays off — the naphthalene content slowly depletes with each treatment.
Frequently Asked Questions
Is mothball smell in a camper dangerous?
Naphthalene (the active ingredient in traditional mothballs) is classified as a possible human carcinogen by the IARC at high concentrations with long-term exposure. The levels found in a camper where mothballs were used for storage are generally not acutely dangerous for occasional visits, but sleeping regularly in a camper with strong mothball smell is not advisable. Ventilate the camper thoroughly before extended stays and treat the odor aggressively. Anyone with asthma or chemical sensitivities should avoid exposure until the smell is completely gone.
Can I use Febreze or air freshener to cover mothball smell?
Air fresheners and Febreze only mask odors — they do not remove naphthalene from fabrics and surfaces. This means the mothball smell returns as soon as the fragrance fades, and you end up with a layered smell that is arguably worse than the original. Use the methods in this guide to actually remove the naphthalene rather than covering it up.
Will the smell eventually go away on its own?
Yes, but very slowly — potentially over many months or even years without active treatment, especially in a well-sealed camper with limited ventilation. Active treatment (vinegar washing, charcoal absorption, ozone treatment, repeated airing) reduces the timeline from months to days or weeks. If you plan to use the camper soon, do not wait for the smell to dissipate on its own.
What should I use instead of mothballs in a camper?
Cedar blocks, lavender sachets, and peppermint oil-soaked cotton balls are all effective moth deterrents without the persistent chemical smell. Cedar is the most effective natural alternative — it repels moths and other insects while absorbing moisture and odors. Replace or refresh cedar every 6–12 months. Keep the camper clean and dry (moths are attracted to soiled fabrics) and inspect stored items before placing them in your camper.