Quick answer
You can mix a homemade mosquito spray, but be realistic about what it does. The popular mouthwash (Listerine) sprays don't work — they're too diluted and evaporate too fast. Dish soap in water can kill mosquito larvae by breaking the water's surface tension, but it won't repel adults. The one DIY ingredient with real backing is oil of lemon eucalyptus, a repellent the CDC recognizes — though homemade mixes aren't tested for the right concentration. For your skin, an EPA-registered repellent is the reliable choice; for your yard, removing standing water and running a trap does more than any spray.
Why people make their own mosquito spray
Search "homemade mosquito spray" and you'll find hundreds of recipes promising a cheap, quick fix with ingredients already in your kitchen. Some are rooted in real science; most are wishful thinking that's been copied from blog to blog for years. Before you mix anything, it helps to know which recipes have evidence behind them and which just smell like they're working. Here's an honest breakdown.
Do DIY mosquito sprays actually work?
| DIY recipe / ingredient | What people claim | What the evidence shows |
|---|---|---|
| Mouthwash (Listerine) + vinegar | Kills/repels mosquitoes | ❌ Myth. Listerine is under ~1% essential oils and evaporates fast; fact-checkers and the CDC's concentration guidance say it won't protect you. |
| Dish soap in water | Kills mosquitoes | ✅ Can kill larvae by breaking surface tension. ❌ Doesn't repel adults, and it harms aquatic life — keep it out of ponds. |
| Oil of lemon eucalyptus (OLE) | Plant-based repellent | ⚠️ A genuinely recognized repellent (CDC) — but homemade versions aren't tested for the concentration or duration that store-bought, registered products are. |
| Lavender / lemon / vanilla oils | Repels mosquitoes | Some short-lived repellency in lab settings; don't expect hours of yard-wide protection. |
| Garlic, cayenne, onion | Repels or kills | Anecdotal; little solid evidence. |
| Beer + mouthwash + Epsom salt | Yard spray | No real evidence it works (details below). |
Why the mouthwash spray myth won't die
The Listerine spray is the most-shared mosquito hack online — and one of the least effective. Mouthwash contains a small amount of eucalyptol, which is found in some real repellents, but at less than ~1% concentration it's far below what's needed to deter a mosquito, and it evaporates within minutes. PolitiFact rated the "Listerine works as a mosquito repellent" claim Mostly False. If a DIY mix feels like it's "working," it's usually the brief masking smell — not lasting protection. (PolitiFact)
If you still want to make one: the honest recipes
Two DIY approaches have at least some real basis. Neither replaces a registered product, but here's how to do them properly:
- Essential-oil skin spray (short-term). Mix a few drops of an essential oil into a carrier (like witch hazel or a light oil) before spraying — never apply undiluted oils to skin. Expect close-range, short-lived repellency, and reapply often. Note that the CDC does not recommend "pure" lemon eucalyptus oil as a substitute for registered OLE repellents, and advises against OLE or PMD products on children under 3.
- Soapy-water larvae treatment. A drop of dish soap in a container of standing water breaks the surface tension larvae rely on to breathe. Use it only on water you're about to dump — never in ponds, fountains or anything that drains to natural water, since soap harms fish and other aquatic life.
The Beer, Mouthwash and Epsom Salt Yard Spray: Does It Work?
This is the recipe you'll see most often for the yard rather than for skin. A version shared on a Virginia TV segment in 2025 calls for one large bottle of blue mouthwash, 3 cups of Epsom salt and 2 large (or 3 small) cans of stale beer, mixed and sprayed over the lawn and shrubs (WDBJ7). It's cheap and it smells strong, which is exactly why it feels like it works. Here's what each ingredient actually brings:
| Ingredient | The theory | What the evidence says |
|---|---|---|
| Mouthwash | Eucalyptol and menthol drive mosquitoes off | Listerine's drug-facts label lists 0.092% eucalyptol and 0.042% menthol. PolitiFact rated the "Listerine repels mosquitoes" claim Mostly False, noting the CDC looks for repellents with at least 10% active ingredient. |
| Epsom salt | The salt repels or dries out insects | Epsom salt is magnesium sulfate, a soil amendment. Washington State University Extension says it is not registered as a pesticide and should never be used as one. |
| Stale beer | The smell keeps mosquitoes away | No study has tested spraying beer on a lawn. The research that does exist points the other way: in two separate studies, volunteers who drank beer got more mosquito landings afterward (Shirai et al., 2002; Lefèvre et al., 2010). |
Put together, no ingredient in the mix is present at a repellent dose, and no study shows the combination works. Georgia garden columnist Walter Reeves called it "an excellent recipe for hogwash." What you actually get is a lawn that smells like mint and beer for an afternoon.
Homemade Mosquito Spray for the Yard: What's Actually Worth Doing
Most yard-spray recipes rely on a strong smell. The trouble is that smells fade fast outdoors, and mosquitoes find you mainly by the carbon dioxide you breathe out. A few quick reality checks:
- Garlic sprays: in a lab test, garlic oil repelled mosquitoes at first, but the effect was gone after about 30 minutes (Mitra et al., 2020, Journal of Medical Entomology). We found no published field trial showing a garlic yard spray keeps mosquitoes down for days.
- Vinegar: the smell is strong but brief. We break down what it can and can't do in why mosquitoes hate vinegar.
- Vanilla extract: no good evidence. A Cleveland Clinic expert gave it "two big thumbs down," noting it may only briefly mask your scent.
- Essential-oil mists: short-lived at best. See how 13 common scents compare in what smells mosquitoes hate.
If you want a DIY yard routine that actually moves the needle, spend the effort on breeding sites and timing instead of the spray bottle:
- Tip and toss weekly. Empty anything holding water: saucers, buckets, toys, tarps, clogged gutters. Mosquitoes can go from egg to biting adult in as little as 7 to 10 days, so a weekly check breaks the cycle. Our guide to mosquito larvae shows where they hide.
- Time your outdoor hours. Many backyard species bite hardest around dawn and dusk. See when mosquitoes are most active.
- Protect your skin with a registered repellent (below) when you're out at peak times.
- Keep the local population down with a trap running through the season. We compare the options in mosquito traps compared.
What's in the Repellents That Actually Work
If what you really want is a spray for your skin, the shortcut is an ingredient that has been through EPA review. The CDC recommends EPA-registered insect repellents with one of these active ingredients (CDC; EPA):
- DEET
- Picaridin
- IR3535
- Oil of lemon eucalyptus (OLE)
- Para-menthane-3,8-diol (PMD)
- 2-undecanone
Two catches matter for DIYers. First, "pure" lemon eucalyptus essential oil is not the same as a registered OLE product: the CDC says it hasn't undergone validated testing for safety and efficacy and doesn't recommend it. Second, the CDC advises against using OLE or PMD products on children under 3. For product picks, see our best mosquito repellent guide.
The one DIY idea with real science: surface tension
That soapy-water trick points to the one principle worth building on. A surfactant breaking the water's surface so mosquitoes can't escape is exactly how the trap in Mosquito TNT 2.0 works on the adults it draws in, alongside a dual-stage reaction that releases carbon dioxide for up to 30 days — the cue mosquitoes use to find a host. (For how it compares with other options, see our best mosquito traps for yards.) You just add warm water to a jar of simple pantry-style ingredients (yeast, sugar, baking soda, citric acid and a surfactant). No electricity, no propane, refillable, DEET-free*, and safe to use around kids and pets when used as directed. It's the reliable version of the soapy-water idea — built to last a month instead of a single bowl. *Not a safety claim.
Prefer to build your own? Our DIY mosquito trap guide covers the yeast-and-sugar bottle trap and its honest limits.
For more yard-level tactics, see our guides on how to mosquito-proof your yard, getting rid of mosquitoes in your room at night, and the best mosquito traps for the yard.
Related reading
- How long do mosquitoes live? Male, female & winter lifespans
- Mosquito hawks: are crane flies actually giant mosquitoes?
Frequently asked questions
Does mouthwash spray actually repel mosquitoes?
No. Mouthwash like Listerine contains under ~1% essential oils and evaporates within minutes — well below the concentration the CDC says a repellent needs. Fact-checkers have rated the mouthwash-spray claim false.
Does dish soap kill mosquitoes?
It can kill larvae in standing water by breaking the surface tension they rely on to breathe, but it doesn't repel adult mosquitoes, and it shouldn't go into ponds or natural water because it harms other aquatic life.
What's the most effective homemade mosquito repellent ingredient?
Oil of lemon eucalyptus (OLE) is the standout: it's on the CDC's list of recommended repellent ingredients. The catch is that the recommendation covers EPA-registered OLE products, not pure lemon eucalyptus essential oil, and homemade blends aren't tested for the right concentration or how long they last.
Do essential-oil sprays (lavender, eucalyptus) work?
They can give short-term, close-range repellency, but the effect fades fast and won't blanket a yard. Use them as a light extra, not your main line of defense.
Does beer repel mosquitoes?
No. There's no evidence that spraying beer keeps mosquitoes away, and two studies found that people who drank beer got more mosquito landings afterward, not fewer.
Does Epsom salt keep mosquitoes away?
No study shows it does. Epsom salt is magnesium sulfate, a garden supplement for magnesium-poor soil, and Washington State University Extension says it is not a pesticide.
Can I make a homemade mosquito spray for my yard?
You can, but garlic, vinegar, mouthwash and beer sprays wear off quickly and haven't been shown to reduce mosquitoes in a yard. Emptying standing water every week and running a trap through the season do far more than any homemade spray.
What actually works better than a DIY spray?
For skin, an EPA-registered repellent is the dependable choice. For your space, remove standing water (the breeding source), screen windows and doors, run a fan, and use a CO2 bait-and-trap like Mosquito TNT 2.0 outdoors.
Sources
- CDC, "Preventing Mosquito Bites." cdc.gov
- CDC Yellow Book, "Mosquitoes, Ticks & Other Arthropods." cdc.gov
- U.S. EPA, "Skin-Applied Repellent Ingredients." epa.gov
- Nguyen, A. (2021). "No, Listerine doesn't work as a mosquito repellent." PolitiFact. politifact.com
- Listerine Cool Mint Antiseptic, Drug Facts label (active ingredients).
- Chalker-Scott, L. & Guggenheim, R. (2018). "Epsom Salt Use in Home Gardens." Washington State University Extension, FS308E. wsu.edu
- Shirai, O. et al. (2002). Alcohol ingestion stimulates mosquito attraction. Journal of the American Mosquito Control Association 18(2):91–96. PubMed
- Lefèvre, T. et al. (2010). Beer consumption and human attractiveness to mosquitoes. PLOS ONE 5(3):e9546. plos.org
- Mitra, S. et al. (2020). Garlic oil repellency in a laboratory olfactometer. Journal of Medical Entomology 57(2):477. oup.com
- Cleveland Clinic (2025). "Does Vanilla Extract Work as a Mosquito Repellent?" clevelandclinic.org
- Reeves, W. "Mouthwash, Epsom Salts and Stale Beer Mosquito Repellent." The Georgia Gardener. walterreeves.com
Mosquito TNT is not currently available in New Mexico and Tennessee.
