[ama]

I've tried most of the above...........my wife has a 330ic cab and the cats love the convertible top......warm and soft. A product called Scat Mat is a clear plastic mat with a filament running through it hooked to a 9v battery pack at one end. It's even waterproof for outdoor use. When anything completes a circuit across two of the filaments................zzzzzap...........just enough to teach them to keep off, adjustable in intensity. I move it from car to car; two incidents is quite enough to discourage future kitty lounging. Also placing in in front of a tire/wheel where they normally mark teaches them an invaluable lesson as well. Product is available on-line or at Pet Smart.........or is that, Pet Not-So-Smart.