We have two cats, the older girl keeps peeing on our hallway carpet and it's stinking the place out... I've sprayed it with various stain removers, sprayed some 'get off' pet spray, which is supposed to stop them doing it... to no avail, does anyone have any suggestions? It's getting to the point where I don't like having visitors for fear of her peeing on it and it stinking the place out, ergh!