Birds should not be forced to bathe.
Birds have what is called a preen gland at the base of their tail.
This contains an oil that cleans and oils their feathers to keep them clean and smooth.
You may offer a bath to your birds, see if they prefer a light misting, and/or offer wet greens for them to rub against or roll on.
If your bird chooses not to bathe, then simply offer it a shallow dish of water periodically.
It can clean its feathers just fine on its own by preening.
Last edited by FaeryBee; 01-12-2016 at 11:00 PM.
Reason: Corrected typos