I don't have personal experience for you, but what you could do is use a PVC tube, I'm sure you could rig it to the sides using some nuts and screws. Another thought would be look in the bird section. Usually they have branches that will have two metal plates to sqeeze between the cage bars. Again, you could rig that up easy by just making a hole in the tub for the washer. I have a pet store by me that specializes in birds and they have branches that are up to 4 ft in length.