I am very new to this, but have gotten some advice recently from a mechanic with 40+ years of experience. He told me to forget the moth balls, and to put a few ceramic plates inside the car and trunk areas, and put several drops of 100% pure peppermint oil on each plate. He says rodents hate it even more than moth balls, and the car smells great in the spring...has anyone else heard of this? Let me know...thanks