*EDIT*
yuck mae, that sucks. Try to get moth balls in a sock and place them around your car. Might work. This old guy showed me that trick for the attic, it work. But make sure u do put it inside a sock and tie the end, cuz those moth balls stick, and u don't want ur VX to smell like an old nursing home or ur grandmas closet forever. After they are gone, or a week or two, take out the sock and get rid of it, and freshen ur VX, cuz it will smell for a while like that, especially in such a small compartment. I did the mistake to spread the moth balls in the attic with out a sock, and my house became a moth hell. I couldn't find a moth near my house for a few blocks, and this house was built in 1920, so it had an attic fan, so every time i turned that fan on, man, all moths around my county fled, lol. I fixed the issue with going into the attic and finding 90% of all the moth balls i spread in the attic, like 100 of them or so, it sucked. Any who, it kept the mice out. also get some food that kills them, but its a speacil kind that they like to eat and kills them from the inside, but what it does it dries them out, so just incase if they die inside ur VX, they won't stink, cuz they don't rote, get dried up like a bone. Good luck, if all fails, take the VX to Japan, and let the little bustards mutate until they get to big to go inside ur VX. that should fix it.