Cat Odor-Off; Soaker No need for clothes pins on noses anymore with Thornell's Cat Odor-Off Soaker. It eliminates cat odors on multiple surfaces and works well on odors such as urine, tomcat spray, feces and more. Cat urine in carpets and other porous surfaces is a significant problem primarily because it can go undetected for a long time. The urine itself has very little odor, but once it starts to decay it becomes a problem. The first stage of decay produces amines (ammonia), which are unpleasant, but the second stage of decay is the worst. This creates mercaptans. (Mercaptans are what make skunk spray smell so bad.) With a carpet this can mean the urine has soaked through the carpet to the floor or deeply into your favorite sofa.