When I shower my birds..."I shower them". There's no way I could spray them (5 hand surgeries/neuropathy), nor do I want my cages, carpets & furniture soaked. Ever since I got them I've showered them in the tub. It goes like this....my U2 & CAG both (not at same time) sit on a table perch in the tub. I spray them with a handheld shower. I lift & spread wings, do under tail, back, chest, under crest, etc. They shake it off in the tub. JaKhu B&G Macaw sets in the tub, no perch. I rinse her off beak to tail, under spread wings, under tail, etc. & then let the shower head hang down, so she can run back & forth. She flaps her wings, jabbers a lot, & plays for as long as I let her. Usually 10 minutes. JaKhu will even lay on her back. Bird is crazy, LOL. With each one I towel off a little, so they aren't dripping wet & then they go back to cages. They love a good soaking shower.
JaJaBinks, previous macaw, would hide behind the shower curtains & pop out saying peek-a-boo.
So my birds basically get showered. I had to teach them showers were fun. Took a while, but slapping water, singing & acting silly eventually got them liking to get a good soaking. Each one has their preferred water temp. U2/warm; CAG/cool, Macaw/room temp.
Now the 2 that have water dishes will stick their feet in, when the vacuum is runnning, and sling water. So dishes get removed before the vaccum gets turned on.
The part I find weird is they hate to get rained on. If they are outside in the aviary (has a roof) & a storm would blow in before we could can them in, they'll hang from the ceiling until it's over.