I used to let my Quaker bathe herself in a big rectangular tupperware container filled with warmish water. She loved it. The Eclectus took showers with a shower perch we bought at a bird store. Now we buy the aloe vera Bird Bath spray and spray them both down daily. It's less hassle than bothering with the tupperware container or getting the shower ready for the Eclectus, then carrying it back to its cage, dripping water all over our wood floors!
When we had little budgies when we were first married, I remember getting them a plastic roundish tube-like thing that attached to the door of their cage for bathing. They loved getting inside & splashing about. I do believe birds need to be bathed for optimum feather health.