Shower perches are terrific for giving your birds baths! You can either use the actual shower head (make sure the water is around room temperature, you DON'T want to burn your bird!) or use a spray bottle. We recommend this method of bathing for birds that are more trusting and won't freak out.
Remember, whichever method you use, it's important for your bird to bathe regularly. Baths help keep their feathers clean and their skin moisturized.