I considered the cat option. Also considered putting one of our ball pythons in the car but we could lose the python, have a hard time getting it out or it could get out of the car entirely. No sound from the stereo so the Streisand option is out. I will try mothballs and bounce dryer sheets. What my brother put in the car last night was an all natural product with a pine scent. Not sure what it is called I think the mothballs would be a more powerful deterrent to get the mice out and the dryer sheets or pine stuff could be a better long-term solution.