i have 2 indoor cats, i know where they poo (in a tray). how ever numerous neighbourhood moggies keep crapping on my lawn, it is very fusturating, and often runny YUCK!!! How can i keep them off my garden, so the kids can play outside without standing in it, and avoiding the health risks. ive tried orange peel, garlic, cat off, and bottles of water. Does anyone have any suggestions,???