- Eleven products were compared for their ability to eliminate cat urine odor in carpet. Their performance on new urine spots and on old spots was compared as was their ability to prevent the return of urine odors after the carpet was cleaned. Newer products marketed to eliminate urine odor did the best in getting rid of and in preventing the return of urine smells. Other products also scored well. A few products were considered to be of little value for the removal of urine odor in carpet.