I have some peppermint oil I can use and I love the smell. The reason it came out was because the car finally got warm and hot air was coming out of its vent.
I hate spiders! I especially hate brown recluse and black widow and we have a lot of them.
I would say use both the oil and run the heat high so it is forced to escape from the heat out of the car because the overall car is too hot and smells too much like peppermint.
https://www.palmengm.com/blog/how-to-get-rid-of-spiders-in-your-car/
Where do Spiders Live in Your Car?
Spiders like to hide in places that are warm and sheltered from the elements. Two of the best places for spiders to tuck themselves are behind your side-view mirrors and in your air vents. Other places include the places under your hood that are away from your engine, but that gather things like leaves. These spots are perfect hiding places for spiders and allow them to hide during the day to return to their webs at night.
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How to Keep Spiders Out of Your Car
Now that you know where to look, go ahead and clean out those areas. You can’t get into your vents, but cleaning under your hood and behind your mirrors should be easy enough. Once you have things looking a little less homey for the crawlers, try these methods to keep them from coming back:
Buy some peppermint or citrus oil. Spiders hate peppermint and any citrus and will avoid those areas. Swap some oil around your side view mirrors, and mix 20 drops of oil with 1.5 cups of water to pray around your vehicle like air freshener.
To keep spiders from coming in through the air vents, swab the vents with the oil or tuck a few lemon peels between the gaps. Not only will this make your vehicle smell lovely, but it will keep the spiders from making a home in your vehicle.
Repeat this process periodically throughout the spider seasons to keep your car free of pests.