Ya ever left a window rolled down and a kitty decides to jump in and use your car as a litterbox? Well, the stuff to use to get the urine or poop smell out (god, i *hate* the smell of cat piss) is called "Nature's Miracle". You get it from a pet store, it's not cheap, but I swear it is the only thing I've tried that works. It doesn't cover odor up, it "eats" it with enzymes. I've tried the basic formula with great results in the past and now just tried the cat-specific formula, just as great. They also have a skunk odor remover forumla for those really unfortunate experiences of trying to domesticate a wild skunk in the back seat of your soob!