Spiders get into cars more often than you’d expect, drawn by warmth, shelter, and the dark crevices that mimic their natural hiding spots. Getting rid of them comes down to three steps: removing the spiders already inside, eliminating what attracts them, and keeping new ones from moving in. Most methods are simple and don’t require professional pest control.
Why Spiders End Up in Your Car
Cars offer exactly what spiders look for: tight, dark spaces with minimal disturbance. Side mirrors, air vents, gaps around door seals, the undercarriage, and the spaces beneath seats all make appealing shelter. If you park near bushes, trees, woodpiles, or outdoor lighting that attracts flying insects, spiders are more likely to hitch a ride or crawl inside when doors and windows are open.
The problem isn’t just cosmetic. In 2011, Mazda recalled more than 50,000 Mazda 6 sedans after yellow sac spiders built webs inside fuel tank vent lines. The webs blocked ventilation, created excess pressure in the gas tank, and raised the risk of fuel leaks and fire. That recall involved 2009 and 2010 models built between April 2008 and February 2010. While that’s an extreme case, it illustrates how spiders can reach surprisingly deep into a vehicle’s systems.
Start With a Thorough Cleaning
Before trying repellents or traps, remove the reason spiders are comfortable. Vacuum every surface inside the car, paying close attention to the areas spiders favor most: under and between seats, inside door pockets, the glove box, the trunk, seat track rails, and any storage compartments. Use a crevice attachment to get into seams where the carpet meets the door frame and along the base of the center console.
Spiders eat other insects, so removing crumbs, wrappers, and anything that attracts flies or ants cuts off their food supply. Wipe down all hard surfaces afterward. If you’ve spotted webs, clear them out completely. Leaving even a partial web can signal to other spiders that the spot is viable shelter.
Use Sticky Traps for Monitoring and Catching
Small glue traps are one of the most effective, low-effort tools for spiders in a car. Spiders prefer to travel along edges and in dark areas, so the best placement is flat against a surface in spots you don’t regularly disturb. Tuck one under each front seat, one in the trunk near a corner, and one on the floor behind the center console if there’s space.
Position the open ends of each trap parallel to whatever surface it sits against so spiders walk naturally into it. Check them every week or two. Beyond catching spiders, the traps tell you whether your problem is ongoing or already solved. Replace them when they get dusty or full, since the adhesive loses effectiveness over time.
Peppermint Oil as a Repellent
Peppermint oil is a widely used natural spider deterrent, and it works reasonably well in an enclosed space like a car interior. Mix about five drops of peppermint essential oil into a 16-ounce spray bottle of water, add a small squirt of dish soap to help it blend, and shake well. Spray it along door seals, around the base of seats, inside the trunk edges, and near any vents or gaps where spiders could enter.
The catch is that peppermint oil doesn’t last long. Plan to reapply once a week, or more often if you notice spiders returning before the week is up. The scent is what drives spiders away, so once it fades, the protection fades with it. Some people keep a cotton ball soaked in peppermint oil tucked under a seat as a longer-lasting alternative, refreshing it every couple of weeks. White vinegar diluted with water works similarly as a spray, though the smell is less pleasant in a small cabin.
Why Bug Bombs Are a Bad Idea
It’s tempting to set off a fogger inside the car and let it do the work, but this approach causes more problems than it solves. Bug bombs are not designed for spaces as small as a car interior. The confined volume concentrates chemicals well beyond the levels intended for a room, and the mist doesn’t reach the hidden crevices where spiders actually hide, like inside vent ducts, under dashboard panels, or within upholstery seams.
The practical downsides are significant. Fogger residue leaves a chemical film on windows, dashboards, and touchscreens that can take multiple detail cleanings to remove. The chemicals can damage rubber seals, dry out plastic and vinyl components, and seep into wiring and electronics. People who’ve used them in vehicles report damaged infotainment screens, persistent chemical odors, and in some cases, respiratory symptoms lasting weeks or months. If you have asthma or allergies, the residue in a space that small is especially risky. Permethrin, a common active ingredient in insect sprays, can persist on indoor surfaces for 20 days or more, and breathing it in causes nose and lung irritation, headaches, dizziness, and nausea. It’s also highly toxic to cats, so if your cat ever rides in the car, avoid permethrin-based products entirely.
Seal Entry Points
Once you’ve cleared out existing spiders, focus on keeping new ones from getting in. Check the rubber weather stripping around all doors and the trunk for cracks, gaps, or sections that have pulled away. Worn seals are one of the most common entry points. Replace any that are visibly damaged.
If you park with windows cracked for ventilation, that’s an open invitation. Even a half-inch gap is enough for most spiders. Consider using a sunshade instead of cracked windows to manage heat. Check your side mirrors for webs regularly, since the housing is a favorite nesting spot. A quick wipe of the mirror cavity with a peppermint oil solution during your weekly application helps keep that area clear.
Change Where and How You Park
Your parking spot matters more than most people realize. Spiders congregate near outdoor lights because lights attract the flying insects they feed on. Parking directly under a streetlight or porch light puts your car in the middle of a spider buffet. Moving even 15 to 20 feet away from the light source makes a noticeable difference.
Parking away from vegetation helps too. Overhanging tree branches, shrubs that touch the car, and tall grass near the tires all give spiders a direct path inside. If you have a garage, using it consistently is one of the single most effective prevention steps, especially if you keep the garage itself reasonably clean and free of webs. For cars that sit unused for days or weeks at a time, spiders are far more likely to settle in. Starting the car and driving it periodically disrupts the vibration-free stillness they prefer.
If the Problem Keeps Coming Back
A spider or two finding their way into your car is normal and usually handled with a single round of cleaning, traps, and repellent. If you’re consistently finding multiple spiders or new webs despite taking these steps, the issue is likely an egg sac hidden somewhere inside the vehicle. Female spiders lay eggs in silk-wrapped sacs tucked into protected corners, and a single sac can release dozens of spiderlings.
Check behind sun visors, inside the spare tire compartment, in the creases of rubber floor mats, and along the headliner edges near the windshield. If you find a sac, remove it with a vacuum rather than crushing it, which can scatter the contents. For persistent infestations you can’t resolve, a professional detailer or pest control service can do a targeted treatment of the interior that’s far safer and more effective than a fogger.