Where the hell are you parking the car that it is infested with mice? Or should I ask, "How long was the car left sitting that an infestation occured?"

I had a similar situation with the Graphite Roadster when I parked it outside and put a stupid-assed 'car cover' over it. For some reason, that attracted ANTs. I mean hundreds of ants moved in over the first weekend the car sat there.
GOt rid of them with poison, never put the cover on again, no problems - parked in the SAME SPOT, even.