Rep Power: 875

i bet you a dollar the cat comes back haha

 
Rep Power: 785

it will come back...they always do, I had one cat that kept comming to my house for almost 4 months, then it dissapeared..It wasnt me if thats what your thinking, now there is a damn cat with the mange that keep going in my back yard...I think if I pelt it with my airsoft gun it wont come back, but I think my gun would kill it...

 
Rep Power: 736

buy a very wide role of masking/transfer tape and turn it upside down on your car and just wait and watch the cat lol.. ever see a cat with tape on it's feel? it's a funny thing.. and i bet it'd never wanna see the car again

 
Rep Power: 783

As it draws out its claws, trying to get grip and get away... putting 1/8 inch deep scratches down your hood....

 
Rep Power: 875

my cat ripped through one of the screen windows so my dad got rid of it

 
Rep Power: 696

get a bb gun

 
Rep Power: 785

Shoot the cat with a shot gun directly at your car, Im sure that would help.

 
Rep Power: 695

That's the first thing that poped into my head when I read the question lol.
And I can't think of anything that will get him off. But if you wait by your car for a while, and just spray the cat everytime he get's near to the car.
One thing I do when cats are on the hood of my camaro is take a sling shot and some paintballs and hit the cat. I dont have a nicely painted hood, but the cat doesnt go near me car now after a couple of times.