Even so with the pistachios... I mean how did they actually get inside the car? Did your wife leave the door open over night or something? I mean a car is pretty well sealed up...
I only dealt with mice in a home once before and that was in a new construction, so as the land was cleared in the subdivision, the field mice had nowhere to go, so they moved in during construction. They were primarily in the wall insulation in the basement... I didn't see any mice here the first year I was here, but now they're everywhere. I guess it's a cost to pay for living rural... The thing is, I can't find where they're coming in. I used to leave the sliding glass door open during the summer so the dogs could go in and out, and they tore the screen out of the screen door at the bottom. I have seen field mice right outside that door and I guess they may have come in that way.
I guess once they get in and set up a nest, they are so prolific it's hard to get rid of them from that point forward...