i live in an area where there must be at least 10 different cats, if you can pinpoint which cat did what you're doing well.
my cats down sit on cars, but my neighbours cat likes the bonnet of my V8, as its proper toasty. but most if any scratches come out with a polish.
Exactly, its not the sort of thing you would follow up on unless it was happening all the time and began to cost quite a few quid to repair. You could always get video/photo evidence and contact animal control to capture the cat and see who the owners are. Again, not something you wold bother with unless it was getting rediculous and you'd already tried discouraging the cat from your property.