Thanks Dej and Kelly. I have four litter boxes in the garage away from any activity in the house. They are all new and kept clean. I've spent enough money on feliway that I could've replaced the carpet .

I've used anti icky poo which I've read great things about BUT I don't think I used enough. We are talking about just ripping up the carpet and living with the concrete underneath. Then just replace the carpet when the lease is up.

I can't take all of the cats when I leave because I'll be staying with my dad for a while and my kids will be staying with their father and don't want me to take away their furbabies. I have to get this done before I leave.

The problem with getting rid of urine is that once it dries under the carpet, it turns to crystals which are very hard to penetrate with liquid from the surface. Also the urine spreads underneath where you can't see it. I have read so much about pee that I feel like an expert .

I will try the litter you recommended Dej. Removing the carpet seems to be the best idea. I know my cats are stressed just like the rest of the family. Two of them are very old so it's doubly hard to retrain them (21 and 18 years).