Set up a ramp next to the car, so the cats can get up without jumping and trying to dig in their claws for purchase.

We had a fine cat named Willie, who left us too soon (his brother, Waylon, is still a family member and now Senior Cat in Charge). Willie used to climb up on a former neighbor's jeep, the same way. The neighbor complained about the paw prints.

I showed the neighbor the brand plaque over the back bumper. I said, "Look, it says 'Willys.' How can you blame him for thinking he has a right to it?"

This neighbor wasn't the sharpest tack in the box, and it took him a minute to figure out I was funnin' him.

Peter.