I took in 3 feral cats and they decided that their litter box was going to be inside my Laz-Y-Boy recliner! They would crawl up inside it from the back, do their thing and sneak away. It took me quite a while to figure out where the stench was coming from.
I solved this problem by flipping the chair upside down, vacuuming it thoroughly, scrubbing it with Lysol, and letting it dry. Then I filled a small spray bottle with mouthwash and sprayed every piece of wood in the frame, being careful not to get the metal parts wet. Then I went around and flipped over all the rest of my furniture and cleaned and sprayed it, as well.
This was about 3 weeks ago, and they have stopped using my furniture as a litter box. I actually saw one of them sneak out from behind their "safe hiding place" in a large dog crate, covered in blankets, and use the litter box. I can't put them back outside, due to our terrible winter weather, so I'm really happy with this solution. I hope this helps everyone else with this problem!
Source: I read somewhere that using mouthwash where cats are inappropriately urinating stops them from going back there. I think it was your "thriftyfun" site.
By catastrofy from Winnipeg, Manitoba, Canada
You mentioned you used mouthwash to get rid of urine odor. Did you use a specific mouthwash?
Baking soda sprinkled all over the urine stained area and left over night then vaccumed up will work.