Should You Wash Off Bug Spray? What the Label Says About Bedtime, Hikes, and Kids
Short answer: Yes. Once you are back indoors, wash treated skin with soap and water and wash treated clothing before you wear it again. That instruction is printed on DEET product labels and repeated by EPA and the American Academy of Pediatrics; the CDC's Yellow Book carries the skin half. No source addresses sleeping in it; the label's cutoff is coming indoors.
What does the repellent label actually tell you to do?
Wash it off when you come inside, and wash the clothes before you wear them again. The instruction is on the bottle. EPA's page on DEET says all DEET product labels include a set of directions to help reduce the chance of DEET irritating your skin or eyes, and two of them are these: after returning indoors, wash treated skin with soap and water, and wash treated clothing before wearing it again.
The label carries legal weight. The same EPA page states that FIFRA requires that pesticides be used according to the approved label, and tells users to always follow the recommendations appearing on the product label. The wash line is one of those label directions.
EPA's general guidance on repellents says it in one line: after returning indoors, wash treated skin and clothes with soap and water. The same page says to apply and reapply a repellent according to the label instructions, not to overuse the products, and to apply the amount of repellent the label indicates.
Should you wash off bug spray before bed?
Yes. Bedtime is the last practical moment to do what the label already told you to do at the door. Say it plainly: no agency we cite addresses sleeping in repellent, in either direction. EPA, the DEET label, the CDC's Yellow Book, the American Academy of Pediatrics and the Massachusetts Department of Public Health all say the same thing: wash when you come indoors. Still wearing it at bedtime means you skipped a step, and bed is where you catch it.
What the sources document is irritation after extended contact. The National Pesticide Information Center says people who have left DEET products on their skin for extended periods of time have experienced irritation, redness, a rash and swelling, and the DEET label itself warns that use of the product may cause skin reactions in rare cases. NPIC's report describes DEET left on skin for extended periods and does not address sleeping. The instruction that does exist is the one on the label: wash when you come indoors.
What happens if you don't wash off DEET?
No source we can cite defines what a single skipped wash does. The label says use of the product may cause skin reactions in rare cases. The National Pesticide Information Center reports that people who left DEET products on their skin for extended periods of time have experienced irritation, redness, a rash and swelling. The CDC's Yellow Book says severe reactions to insect repellents are rare, and that a traveler with a rash, itching or swelling from a repellent should wash it off with mild soap and water and stop using it. For picaridin, NPIC says some people have had skin irritation from products containing it, although this is very uncommon.
The reassuring half is in NPIC's DEET technical fact sheet: researchers determined that 5.6 percent of a dose of technical grade DEET was absorbed through the skin, DEET did not accumulate in superficial layers of human skin, and most of the absorbed dose was eliminated within 12 hours of application with nearly all of it gone within 24 hours. NPIC's general fact sheet compresses that to one line: nearly all of the DEET taken in through the skin is eliminated by the body within 24 hours of applying it.
So the documented downside lives at the skin, and every source we cite tells you to wash it off. The longer record is in our review of the DEET safety evidence.
Does bug spray absorb into your skin?
Some does, and the body clears nearly all of that fraction within a day. The figures come from the National Pesticide Information Center's technical fact sheets, which we cite in place of the underlying studies. For DEET, the sheet reports 5.6 percent of a dose of technical grade DEET absorbed through the skin, and 8.4 percent when the DEET was in an ethanol solution. Most of the absorbed dose was eliminated within 12 hours and nearly all within 24, and essentially all of it, less than 10 percent of what was applied, was excreted in the urine.
For picaridin, NPIC's technical fact sheet reports that less than 6 percent of the applied doses were absorbed after an 8-hour exposure. Treat that as an upper bound from an 8-hour exposure. On the way out, NPIC says excretion of radio-labeled picaridin applied to the arms of human volunteers was nearly complete in 24 hours. The on-skin side of the question is in how long picaridin lasts.
How do you wash bug spray off skin?
Soap and water. Every source that addresses removal says to wash, the ones that name a cleanser all name soap and water, and none of them names a special cleanser: EPA for treated skin and clothes, the DEET label for treated skin, the CDC's Yellow Book (mild soap and water) for a rash or other reaction. The Massachusetts Department of Public Health says to wash your skin and the clothes that had repellent on them when you come inside.
Hands first. NPIC notes it may be possible to swallow DEET if the hands are not washed after using DEET on skin. Then the laundry: DEET labels say wash treated clothing before wearing it again, and the American Academy of Pediatrics says the same for children's clothes.
After a hike in tick country the shower does two jobs. The CDC says showering within two hours of coming indoors has been shown to reduce your risk of getting tick-borne diseases, that showering may help wash off unattached ticks, and that it is a good opportunity to do a tick check. The back-at-camp routine is in insect repellent for hiking, and the tick check in Lyme disease prevention.
How long should you leave bug spray on?
For as long as you are outdoors and need it, then off when you come in. No source we cite publishes a maximum number of hours a repellent may stay on skin. The instruction that exists is the label's: after returning indoors, wash treated skin with soap and water.
What the sources do say is that more is not better. EPA says to apply and reapply according to the label instructions and not to overuse the products. The CDC's Yellow Book says to use just enough repellent to cover exposed skin or clothing, and that heavy application and saturation are generally unnecessary for effectiveness.
How do you wash repellent off kids?
Soap and water or a bath, as soon as they come in. EPA's note for children says that after returning indoors, wash your child's treated skin and clothes with soap and water, or bathe. The CDC's Yellow Book says to wash children's treated skin and clothing with soap and water after returning indoors, or give the child a bath. The American Academy of Pediatrics says to wash your children's skin with soap and water to remove any repellent when they return indoors, and to wash their clothing before they wear it again.
If a child reacts, the American Academy of Pediatrics says to stop using the product and wash the child's skin with soap and water. Ages, application and the rest of the routine are in mosquito repellent for kids.
For infants, the sources lead with clothing and netting. The CDC says travelers can protect infants from insect bites by dressing them in clothing that covers their arms and legs, by covering strollers and baby carriers with mosquito netting, and by using appropriate insect repellent. The Massachusetts Department of Public Health says DEET products should not be used on infants under 2 months of age, and to use mosquito netting on baby carriages or playpens when your infant is outside.
Can you sleep with bug spray on?
No source we cite addresses sleeping in repellent in either direction. What the label does say is to wash treated skin with soap and water after returning indoors, and EPA's general guidance says the same for skin and clothes, so the answer is built from the instruction that exists: come in, wash it off.
What the agencies name for the night is a barrier. The CDC says to sleep under a mosquito net if you are outside or when screened rooms are not available, and notes that mosquitoes can live indoors and bite during the day and night. The World Health Organization, writing about malaria, says to use mosquito nets when sleeping in places where malaria is present. For infants the tool is netting: over strollers and baby carriers per the CDC, on baby carriages or playpens per the Massachusetts Department of Public Health.
We will not tell you that repellent works indoors or that it does not, because none of our sources says either.
How long does bug spray smell take to go away?
No published figure exists, so we will not give you one. The National Pesticide Information Center describes DEET as a colorless liquid with a faint odor, and technical grade picaridin as a colorless liquid with little odor. NPIC describes the actives themselves as barely scented, so those two sheets do not account for a repellent that fills the tent.
We have no sourced trick for getting a scent off faster and will not invent one. Removal is the same step as everything else here: EPA says wash treated skin and clothes with soap and water after returning indoors.
Common questions
Should you wash off bug spray before bed?
Yes. EPA says to wash treated skin and clothes with soap and water after returning indoors, DEET product labels carry the same direction for treated skin, and the American Academy of Pediatrics says to wash children's skin with soap and water to remove any repellent when they return indoors. No source addresses sleeping in it; the instruction you have is the wash-when-you-come-in line, and bed is the last chance to follow it.
What happens if you don't wash off DEET?
No source defines the result of one skipped wash. What is documented is at the skin: DEET labels say use may cause skin reactions in rare cases, and the National Pesticide Information Center says people who left DEET products on their skin for extended periods have experienced irritation, redness, a rash and swelling. NPIC's technical fact sheet reports that most of the absorbed dose was eliminated within 12 hours and nearly all of it within 24 hours.
Can babies wear bug spray overnight?
No source addresses it, and the infant guidance points elsewhere. The Massachusetts Department of Public Health says DEET products should not be used on infants under 2 months of age, and says to use mosquito netting on baby carriages or playpens when your infant is outside. The CDC lists clothing that covers arms and legs and netting over strollers and baby carriers, and its overnight tool is a mosquito net where screened rooms are not available.
Does washing remove the bug spray smell?
Washing is the only removal step any source gives: EPA says to wash treated skin and clothes with soap and water after returning indoors. As for the smell itself, the National Pesticide Information Center describes DEET as a colorless liquid with a faint odor and technical grade picaridin as a colorless liquid with little odor, so those two sheets do not account for a strong scent.
None of this is medical advice. If a rash, itching or swelling follows a repellent, wash it off with soap and water, stop using it, and talk to a clinician.
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 label claims include fragrance free and no chemical scent or odor, and its label directions say to wash thoroughly with soap and water after handling, to stop and see a doctor if irritation or rash occurs, and to use no more than two applications a day.
Sources
- EPA, DEET. https://www.epa.gov/insect-repellents/deet
- EPA, Using Insect Repellents Safely and Effectively. https://www.epa.gov/insect-repellents/using-insect-repellents-safely-and-effectively
- CDC Yellow Book, Mosquitoes, Ticks, and Other Arthropods. https://www.cdc.gov/yellow-book/hcp/environmental-hazards-risks/mosquitoes-ticks-and-other-arthropods.html
- American Academy of Pediatrics, HealthyChildren.org, Insect Repellents. https://www.healthychildren.org/English/safety-prevention/at-play/Pages/Insect-Repellents.aspx
- Massachusetts Department of Public Health, Mosquito Repellents. https://www.mass.gov/info-details/mosquito-repellents
- 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, DEET Technical Fact Sheet. http://npic.orst.edu/factsheets/archive/DEETtech.html
- NPIC, Picaridin Technical Fact Sheet. http://npic.orst.edu/factsheets/archive/Picaridintech.html
- CDC Travelers' Health, Avoid Bug Bites. https://wwwnc.cdc.gov/travel/page/avoid-bug-bites
- WHO, Malaria fact sheet. https://www.who.int/news-room/fact-sheets/detail/malaria
Last reviewed 2026-09-09 · every claim on this page is sourced above