You can try using a number of natural remedies to get rid of the smell of cat urine. One is to spray a mixture of vinegar and water onto the area. If that doesn't work you can try mixing a cup of hydrogen perioxide and a teaspoon of regular dish detergent in a bottle. Then applying the mixture to the area. Finally, if the natural remedies does not work, you can try a commercial product such as OdorXit.