Go to the Drs. Foster and Smith website: http://www.drsfosterandsmith
Look up the cat products and you will find lots of stuff to get rid of cat urine smell. I personally swear by Resolve Pet Odor and Stain Remover. It got rid of old feces and urine stains for me when nothing else would, although I haven't tried the Drs. F & S products. (other people recommend their stuff highly).