Bug Spray on Clothes or Skin? What Goes Where, What DEET Does to Synthetics, and How to Wash It Out
Short answer: Both, and never in between. EPA says to apply repellents only to exposed skin and/or clothing, and not under clothing. NPIC calls DEET a plasticizer that can damage certain synthetic or treated fabrics, and says it does not damage cotton or wool. Permethrin is the repellent used to factory-treat clothing. Wash treated clothing before wearing it again.
Do you put bug spray on skin or on clothes?
Both, as long as the clothing is on the outside. EPA's guidance on using repellents is to apply them only to exposed skin and/or clothing, and not to use them under clothing. The CDC's Yellow Book says it in its own words: apply repellents only to exposed skin or clothing, as directed on the product label, and do not apply to skin covered by clothing. The CDC's mosquito-bite prevention page: do not apply repellent on the skin under clothing.
The product label carries the same two directions. EPA's DEET page lists them: use just enough repellent to cover exposed skin and/or clothing, and do not use under clothing. NPIC's DEET fact sheet gives the reason for the second one. People have had adverse reactions to DEET when they applied it to skin that was under clothing, and when they applied it to parts of the body that contacted other skin surfaces. NPIC lists the human body, clothing and headgear among the sites where DEET repellents are used, and the label rules out the skin underneath.
The amount is a thin film. EPA says to read the label and be sure you understand how much to apply; the CDC's guidance is to use just enough repellent to cover exposed skin or clothing. The CDC says heavy application and saturation are generally unnecessary for effectiveness, and that if biting insects do not respond to a thin film of repellent, you apply a bit more.
Picaridin follows the same skin-or-clothing rule. NPIC says picaridin can be used on human skin or clothing to repel mosquitoes, biting flies, ticks, fleas and chiggers, and NPIC's technical fact sheet states that picaridin is registered for use on the human body and clothing. EPA also registers products consumers can spray on clothing to repel mosquitoes and ticks; the ones currently available contain DEET, permethrin or picaridin. The trailhead routine is the same whichever active you carry: repellent on the skin that shows, repellent on the outside of what covers the rest, nothing underneath.
Does bug spray stain clothes, or does it damage them?
The evidence is about damage, not dye. The primary source, the National Pesticide Information Center's DEET technical fact sheet, says nothing about color. What NPIC says is that DEET, a plasticizer, can damage certain rubber, plastic, vinyl or elastic materials, and it names them: contact lenses, eyeglass frames and lenses, watch crystals, combs, painted and varnished surfaces, and certain synthetic or treated fabrics.
The same fact sheet gives the other half: DEET does not damage natural fibers including cotton and wool. A cotton T-shirt or a wool sock is not on NPIC's list. Anything elastic, and anything synthetic or treated, sits in the group NPIC says DEET can damage. NPIC's word is "certain," so not every synthetic will react, but the category is the warning. If something synthetic came out of a DEET summer feeling or fitting different, the plasticizer note is the explanation the sources support.
Picaridin's fabric record is thinner, and we will not pad it. NPIC's picaridin technical fact sheet reports that picaridin applied to cloth deterred insects from biting through the cloth to the skin, says insects that encounter treated skin or clothing move away from the chemical and do not feed, and lists picaridin as not soluble in water. No approved source we could find says whether picaridin stains or damages any fabric, so this post does not say it either. Neither NPIC sheet reports on visible discoloration by either active. The materials comparison lives in our picaridin vs DEET post.
How do you get bug spray out of clothes?
The American Cleaning Institute's answer is pretreat, wash hot, check before the dryer. The American Cleaning Institute's starting point: most commercially available bug sprays and sunscreens do wash out relatively easily.
First, the American Cleaning Institute says, pretreat the stains with a prewash stain remover, then launder using the hottest water that is safe for the fabric. The last step is the one that saves the shirt: the American Cleaning Institute says to check that the stains are gone before you put the garment in the dryer, because heat could set stains that have not washed out.
The label sets the timing. EPA's DEET page carries the direction to wash treated clothing before wearing it again, so the wash is a label direction, not only a stain fix, and it applies whether or not you can see anything on the shirt.
How long does bug spray last on fabric?
Nobody we cite publishes a number, and this post will not make one up. The hours on a repellent label describe skin. EPA's repellency awareness graphic identifies the type of pest a product is expected to repel and the amount of time the repellent will be effective, and EPA says the graphic will be available only for skin-applied insect repellent products. EPA's repellent search tool draws the same line: its results include only skin-applied repellent products registered by EPA.
Even on skin the figures spread. EPA notes that while its technical information is based on scientific testing guidelines and approved study methods, there are variations in the resulting protection times because of differences in the testing conditions. For DEET, EPA says studies in its database indicate DEET repels ticks for about two to ten hours, and mosquitoes from two to twelve hours, depending on the percentage of DEET in the product. That is a skin range, and it is already wide.
On fabric, the closest thing to a duration statement is the CDC's Yellow Book, which says clothing treated with repellent products such as DEET provides protection from biting arthropods but will not last through washing and will require more frequent application. The CDC attaches no hours to that sentence.
We could not find an EPA, CDC or NPIC figure for how long a skin repellent keeps working on a shirt, and we will not derive one from skin data. Reapply on the label's schedule, treat a wash as a reset, and if you want fabric that stays treated across washes, that is a different product.
Which repellent is actually made for clothing?
If you want fabric that stays treated, the product is permethrin, and our permethrin clothing guide covers it in depth. EPA says the only insect repellent currently used for factory treatment of clothing is permethrin. The CDC's Yellow Book says that at a concentration of 0.5 percent, permethrin-treated clothing repels and kills chiggers, ticks, mosquitoes, and other biting and nuisance arthropods, and that travelers can treat clothing, hats, shoes, mosquito nets, outerwear and camping gear with permethrin for added protection.
The wash story is the opposite of DEET's. The CDC says permethrin-treated materials retain repellency or insecticidal activity after repeated launderings but should be retreated as described on the product label to provide continued protection, and EPA adds that small amounts of permethrin can come off in the wash, as shown by available scientific studies.
Never on skin. The CDC says permethrin should never be applied to the skin but only to clothing, mosquito nets or other fabrics as directed on the product label. A treated shirt also covers only what it covers: EPA says only the skin surface covered with factory-treated clothing is protected from the pests listed on the label, and that other exposed parts of the body should be treated with an insect repellent labeled for use on human skin. That pairing, permethrin on the layer and a skin repellent on the rest, is the two-layer system.
Two label details, and one number to distrust. EPA says permethrin products used for factory treatment of clothing or as spray-ons for clothing are not to be applied to certain clothing such as underwear, and that the label instructs consumers to wash permethrin-treated clothing separately from non-treated clothing. The number: a 2019 study in Parasites & Vectors (Gopalakrishnan et al.) reports that, in contrast to the manufacturer's claim of 70 washings, bioefficacy rapidly declined after four washings in its tests, and the authors write that the rigorous washing and drying methods adopted in tropical regions might lead to a higher loss of permethrin than reported in standard laboratory conditions. The 70 is a manufacturer's number, the four came from one washing method, and neither one is an EPA figure or carries over to a machine-washed shirt.
Do you have to wash clothes after spraying them?
Yes, for skin repellents. EPA's general guidance is that after returning indoors you wash treated skin and clothes with soap and water; for children, EPA's wording is to wash your child's treated skin and clothes with soap and water, or bathe. The DEET label directions cover both surfaces: after returning indoors, wash treated skin with soap and water, and wash treated clothing before wearing it again.
Clothing meant to stay treated follows its own label instead. The CDC's Yellow Book tells travelers to follow instructions on the product label for handling repellent-treated clothing. For permethrin, EPA says the label instructs consumers to wash permethrin-treated clothing separately from non-treated clothing, because those products are not to be applied to certain clothing such as underwear. So the rule splits by product: a skin repellent gets washed out before the next wear; a permethrin-treated shirt gets washed the way its own tag says, apart from the rest of the load, and retreated as its label describes.
Common questions
Will bug spray stains come out?
Usually, according to the American Cleaning Institute. The American Cleaning Institute says most commercially available bug sprays and sunscreens do wash out relatively easily. The American Cleaning Institute's steps: pretreat the stains with a prewash stain remover, launder using the hottest water that is safe for the fabric, then check that the stains are gone before the garment goes in the dryer, because the American Cleaning Institute warns that heat could set stains that have not washed out.
Does DEET permanently stain clothes?
The primary source does not talk about stains; it talks about damage. NPIC says DEET, a plasticizer, can damage certain rubber, plastic, vinyl or elastic materials, including certain synthetic or treated fabrics. NPIC also says DEET does not damage natural fibers including cotton and wool. We found no approved source on permanent discoloration, so treat a mark as a stain to wash out and a changed synthetic as plasticizer damage.
Can you spray DEET on clothes?
Yes, on the outside. EPA says to apply repellents only to exposed skin and/or clothing, and the DEET label direction is do not use under clothing. Check what the garment is made of first. NPIC says DEET can damage certain synthetic or treated fabrics and certain elastic materials, and that it does not damage natural fibers including cotton and wool. Cotton and wool take it; synthetics and elastic are the ones to think about.
Does bug spray on clothes work?
Yes, with limits. The CDC's Yellow Book says clothing treated with repellent products such as DEET provides protection from biting arthropods but will not last through washing and will require more frequent application. NPIC reports that picaridin applied to cloth deterred insects from biting through the cloth to the skin. For fabric meant to stay treated, EPA says permethrin is the only insect repellent currently used for factory treatment of clothing.
How long does bug spray last on fabric?
No agency we cite publishes an hours figure for a skin repellent on fabric, and we will not invent one. EPA's repellency awareness graphic, the protection-time mark on labels, is available only for skin-applied insect repellent products, so label hours describe skin. On fabric, the CDC says clothing treated with products such as DEET will not last through washing and will require more frequent application. Reapply per the label, and treat a wash as a reset.
About Longsleeve
Longsleeve is an EPA-registered picaridin lotion (EPA Reg. No. 101457-1). It repels mosquitoes and ticks for up to 14 hours. Its approved label claims include that it does not damage plastic, and its directions say to apply evenly to skin in a thin layer and not under clothing.
Sources
- US EPA, Using Insect Repellents Safely and Effectively. https://www.epa.gov/insect-repellents/using-insect-repellents-safely-and-effectively
- NPIC, DEET Technical Fact Sheet. http://npic.orst.edu/factsheets/archive/DEETtech.html
- US EPA, Repellent-Treated Clothing. https://www.epa.gov/insect-repellents/repellent-treated-clothing
- US EPA, DEET. https://www.epa.gov/insect-repellents/deet
- CDC Yellow Book, Mosquitoes, Ticks, and Other Arthropods. https://www.cdc.gov/yellow-book/hcp/environmental-hazards-risks/mosquitoes-ticks-and-other-arthropods.html
- CDC, Preventing Mosquito Bites. https://www.cdc.gov/mosquitoes/prevention/index.html
- NPIC, DEET General Fact Sheet. http://npic.orst.edu/factsheets/DEETgen.html
- NPIC, Picaridin General Fact Sheet. http://npic.orst.edu/factsheets/PicaridinGen.html
- NPIC, Picaridin Technical Fact Sheet. http://npic.orst.edu/factsheets/archive/Picaridintech.pdf
- American Cleaning Institute, Ask ACI: Bug Spray and Sunscreen on Clothes. https://www.cleaninginstitute.org/cleaning-tips/clean-home/ask-aci/ask-aci-bug-spray-and-sunscreen-clothes
- US EPA, Repellency Awareness Graphic. https://www.epa.gov/insect-repellents/repellency-awareness-graphic
- US EPA, Find the Repellent that is Right for You. https://www.epa.gov/insect-repellents/find-repellent-right-you
- Gopalakrishnan R et al., Parasites & Vectors, 2019. https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6664487/
Last reviewed 2026-09-09 · every claim on this page is sourced above