Nok-Out Multi-Purpose Cleaner & Odor Eliminator is the best cleaner for cat urine. Although not an enzymatic cleaner, but an oxidizer, Nok-Out is proven to work wonders in removing cat pee odors. According to customer reviews, Nok-Out is better than other enzyme cleaners from Nature’s Miracle.  Nok-Out works on almost every surface. It is environmentally gentle and doesn’t produce any chemical fumes making it safe for pets and people, even people with allergies or with immune deficiencies. This cleaner eliminates even the toughest odors including skunk odor and cat pee. No rinse required, just spray or douse and let it work its magic. Nok-Out is non-corrosive, non-flammable, non-chlorinating, hypo-allergenic, and biodegradable.