well i tried it because two of my rats were just habitually destroying water bottles, so i covered up the metal part where they get the water, and sprayed all the plastic down, and it seems to have broken the habit. we already had some because our dog liked to chew on shoes, and it is basically odorless. i tried it though, and its super bitter, but i dont think its unhealthy. i wonder if it would work on the whole tub though....hmm.