Apparently lion scat is a good cat repellent, unfortunately theres never a lion around when you need one and smearing scat all over the hood may make you unpopular at Z4 meets. I have a cat and he has cat friends, so, I keep the car in the garage and I have an ultrasonic pest deterrent constantly plugged in for other furry uninvited guests. I'd investigate a deterrent spray thats fabric safe.