So as the title suggests, I am looking for a way to keep stray cats (which slip through our parking garage gate) from climbing onto and dirtying/defecating on/peeing on/coughing up hairballs on my car, which they do almost nightly. I tried cayenne pepper, both around the car and on the hood. I tried vinegar. I tried citrus smells. What are my other spray options for keeping off cats? Are other furniture repellents safe to use on a car? I think there's too many different stray cats in the neighborhood for it to be a "teach them a lesson once" situation. Has anyone solved a similar problem.