The pee couldn't be that old could it? I would definately cut it up and soak in detergent overnight...wash and soak again and put some venigar in the rinse and hang in the sun...it should come out...I don't know about cat pee tho....
I love all animal but friends are not allowed to bring animals to my house or smoke or drink. I have enough of them...all three of them and they are trained lol.....