Cant seem to find my answer in SEARCH.. So--we have an outside stray cat who poops in the parking overhand gravel and Moses has discovered this source of "goodies'YUCK! SOOO- is there anything to put down that will deter the cat from pooping there or something I can sprinkle or spray on it that will make it less than attractive to Moses without harming him? YUCKY--nasty doggy breath when he comes in!