Easy fix, just slather the car with lard right before you go to bed. That or you could give the whole thing a bath in that 'essence of Bengal tiger urine' they sell as cat repellant. Either way you wouldn't be bothered bycat prints - probably because you wouldn't go near the car.
A bucket of rancid yak fat will work, too, and it's a great conversation starter. Just the thing to cover your datemobile with. -- Jim