My husband is in the flooring business. He replaces carpet in alot of rentals and most of them have some sort of pet damage (pee) He uses a product called TKO Orange. It takes the smell out and stops the animal from using that spot. It is wonderful and he makes good money when he uses it. It is not cheap, but it has a million uses, takes stains of clothes, tree sap off cars. We have fruit trees in the back yard and the neighbors cats thinks they are their personal outhouse. We sprayed under the trees and no more cats