Cat Piss.

So...........back to the OP. I had a serious mouse pee problem in my Valiant, and my girlfriend had a puppy that had many an accident on the carpet at my house. I used some stuff called Urine Digester to clean it up. I got it at an industrial cleaning supply store. It may take a couple of doses, and you have to really soak the area, but it worked excellent for me.