Hi, I understand your frustrations. I had the same problem with Emily for months after I got her. I tried everything (after two rounds of anti-biotics for a stubborn UTI).

I also had a couch that Emily peed on, so I ended up having to throw it out because it was sooooooo bad. I then rented a carpet cleaner and pre-treated the areas for animal stains. I then steam cleaned the carpet twice (just to be on the safe side). In the mean time I moved her litter box out of that room and kept it barricaded for quite awhile. I have also put another carpet (i.e., throw rug) over the "favorite" area.

Since I have done all of this things have mproved greatly. I thought she might start up again when I got a new kitten, but she didn't.

I have also found that the Woollite brand of animal stain remover works wonderfully for my guys.

Good luck, this will require plenty of patience but it will be worth it.

Cheryl