[Quote] I have found "Nok-Out" to work better than anything else. It is amazing. Make sure that if you use an enzymatic cleanser (such as Nok-Out, Nature's Miracle, or Out) after having tried any other type of cleanser, that you first pre-treat with a baking-soda and water mixture to remove the acidity of the previous cleansers. If you do not do this, the enzymes that "eat" the old urine will not be able to do their job. Also, make sure that you completely saturate the area that was peed upon. The cleanser has to reach all areas the urine touched, so it may take a good amount if the cat peed on furniture or padded carpets. [/end quote]