Are you talking about a rug? If so, you need to get a rug cleaner....pour Febreeze on the whole area with water and immediatly suck it up. You will have to do this many times over and over ....you need a powerful sucker machine ....it's worked for me. Once you get urine on a rug I don't care what you pour on it---the odor never goes away (unless you pour bleach but that is not likely). You need to completely get the urine out of it. Pour solution and suck it out.
The house I own now is completely tiled.....and that's the way it will always be for me....
I did not know where she had done it. There were too poop piles, one near a carpet sample used as a throw rug over the indoor outdoor carpet.
I think I got lucky and she must have done it on the little carpet sample, which did not go through.
Friend says to get her black light and you can actually find it, or let the other cat sniff it out and just watch her.
All is much better now that I have tossed the carpet sample out.
I did Fabreeze and the stuff I got at the hardware. I'll get a bottle of what mewzilla said next time I find myself in town.
Thanks again.
BA