To get the smell of other cats off things you really need to clean it with a cleaner that has enzymes in it....The vet told us washing liquid with enzymes was the best.....we used to have a cat that pee'd in the house and I can tell you that the other two cats we had always knew where he had pee'd if I cleaned it with anything else...Cant remember the name of the one I used....but it might be worth a try....