I have 3 neutered cats, 2 male, 1 female. There has been a young unneutered tom hanging around and coming into our house for the last 6 weeks or so and it is making my cats stressed out. One of them, who is prone to spraying occasionally anyway has started to spray in every bloody room in the house. I've bought one of those diffuser things but it's not made a bit of difference, in fact, in the last few days the spraying has seemed to got worse, and the other male cat has started to do it too! Has anyone used the magnetic cat flaps that are supposed to keep other cats out of your house? Any tips for getting rid of the smell of cat piss!?