How do you bath a bird?

Most birds do take baths. I see the wild birds splashing around in puddles all the time. At the wildlife rehab where I volunteer, we give the birds shallow bowls of water for baths. I spray my cockatiel with a mist bottle every other day to help keep feather dust under control. If I miss a few days in a row, he sneezes from the extra feather dust. I'd never use the chemicals, though! Birds don't need that stuff. Aloe is okay on occasion, but that's about it.