before my cat died (in jan) he started peeing all over the house. And no matter what I did to this day I can still smell it. Luckily I have to change all the flooring because I said so (hehe dh is not to keen) but I did everything, I washed, bleached, shampooed, bought stuff from pet smart and I did find a product called odoban to work. But it never ever goes away.

You need to stop it right now. Start leaving their stuff outside because if you cats get a wiff they will start to mark their territory and then you will have to deal with stinky cat pee, and trust me, you don't ever ever want to deal with it. It was so bad, I would cry because the smell was so bad.