Seeing spiders crawling in the home can feel unpleasant, and if you have arachnophobia, you may get scared too. In that situation, finding the best way to get rid of spiders becomes essential. Lysol is one solution you can consider. However, a common question many homeowners have is, “Do spiders hate the smell of Lysol?” As spiders don't have a nose, so there isn't scientifically proven evidence they "hate" Lysol's scent the way we hate, say, the smell of bleach.
I get asked this a lot after covering whether Lysol kills spiders on contact: if spraying it directly can eventually suffocate a spider, does the smell lingering in a room keep new ones from showing up at all? After digging into the research and watching a few corners of my own garage for a week after spraying, here's what actually holds up.
Can Spiders Even Smell Lysol?
Spiders don't have nostrils like humans do. Instead, they pick up chemical signals through tiny sensory hairs and pores located on their legs. A 2024 study in the Proceedings of the National Academy of Sciences found that male spiders use specialized "wall-pore sensilla" on their legs to detect pheromones, essentially smelling with their feet instead of a face. Researchers found that as little as 20 nanograms of a chemical compound was enough to trigger a clear response.
That system exists mainly to track prey and find mates, and not to flag the presence of Lysol in the room. A spider crossing a Lysol-treated surface may register the chemical residue through contact. However, there's no real evidence that spiders find the smell unpleasant enough to avoid it.
Why It Looks Like Lysol Repels Them Anyway?
- Lysol's active ingredients, mainly benzalkonium chloride and alcohol, are built to kill germs, not insects. When Lysol is sprayed directly on a spider's body, it can clog the spiracles through which spiders breathe and eventually kill them, which I covered in more detail in that Lysol article linked above.
- Some homeowners assume Lysol spray keeps spiders from coming back just because they don't see spiders in the treated corner later. More likely, the spiders were killed immediately, or the residue made that corner temporarily unpleasant to cross. It doesn’t mean the smell scared them off.
- A real repellent keeps spiders from arriving in the first place. Lysol reacts with spiders only when it touches them directly, and whatever deterrent effect exists soon fades as the surface dries and collects dust again.
- Like Lysol, peppermint oil, vinegar, and citrus sprays also have the "spiders hate this smell" reputation online, but there’s no proven evidence for it. A few lab tests suggest some spiders avoid strongly acidic or concentrated essential oil residues for a short time. Still, nothing points to lasting aversion to any household scent, including Lysol. Treat all of them as short-term deterrents at best, not a fix.
What Actually Keeps Spiders Away Long-Term?
Colorado State University Extension's spider fact sheet, last reviewed in 2025, puts it: pesticides and sprays "without some effort to remove or modify favorable spider habitats will not be effective."
Their recommendation is to seal cracks around the foundation, clear woodpiles and clutter near the house, and reduce the insects spiders come inside to hunt. That matches what I've seen firsthand.
Spraying a room with Lysol, essential oils, or even Windex handles the spider you can see, but none of them stop the next one from wandering in through a gap under the door. If the goal is to deter spiders and find a permanent solution instead of just handling the ones you can see, a professional pest control treatment aimed at their food source tends to last far longer than any scent.
The Bottom Line
Lysol isn't a spider repellent the way people mean when they talk about a "hated smell." Spiders don't sense it because they don’t have nostrils, and the small deterrent effect some people notice is usually just leftover residue and dead spiders, not an indication that they're avoiding the odor. If you want something to act upon the spiders immediately, Lysol can work in a pinch. If you want to keep a check on the spiders, invest time in sealing gaps and cutting off what they're hunting for indoors, like insects.
