[Woj]

I've heard that an exposed bar of soap in the car will do this. I do it every year. So far no rodents. I keep a bar of soap and a box of charcoal in each trunk and interior.

Also, another member here told me several years back to lower the sunvisors. The critters like to perch on there then eat into the headliner.
That is where I've seen most headliner holes, just above the visors.

Phil Woj.