Have put a mat over top ,heavy rain so no sign of cat.
Fortunately it does not go on the car body , comes over fence onto roof. Our dog keeps it away from the rest of the drive.
Decided to get a small half cover , that should help, and be quick to put on.
While not really wishing it harm, it does annoy me the way cat owners seem to consider it OK for their pet to wander[and mess up] in everyone's gardens---most owners of other pets do not take this attitude. In fact I can not blame the cat ,its the owners.