Thanks. I only have 3 places to clean. The Vet said that until we get the youngest neutered, they will mark. Even after I get Bonte neutered, they will mark the areas that I have cleaned. So, I plan on spraying a neutralizer on the places that they have marked. The weird thing is that it is mainly the older, neutered male that is doing it! I can clean it up, but I just can't seem to stop him from doing it in the first place. The only thing that I know to do is to close off the house except the room we are in and stop him when I catch him in the act.