Sprinkle some peppermint essential oil onto some tissues or paper towels and stick the sprinkled part into the top portion of the vents.
I suppose you can also get a pack of car air fresheners and put all of them up into the car at the same time or spray lysol.
Make the car really smelly.
Or run either the air conditioner at the highest or the heat
for ten minutes.
Make the car inhospitable.
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.