Peppermint oil on my car

Okay so I have a spider issue with my car. I live in an apartment and I’m forced to park under a tree so my car gets covered in them. I have the worst arachnophobia so this is a big issue for me. I know peppermint oil is super effective in deterring spiders but is harmful to cats. If I put it outside of my car would it impact my indoor cats at all? I’m worried about getting it on my clothes or smelling like it and then it harming them.