We've had our grey for a year and in a half in that time, she's barely had a shower. She clearly wants to bathe as she spahes about in her water bowl but that barely gets her chest wet. Beyond that, we've never managed to give her a shower without her aving a near heart attack -- splashing water above, trying in the shower, etc. I don't know what else to do.
Her feathers are all rough looking...she's clearly in need of a shower!
Because of that need I am really tempted to just put her in a travel cage outside in a sunny day, get the hose, and spray from above as if it were rain. But I'm just scared she'll just injure herself by trying to flap about (and not really get wet if she doesn't try to catch the water -- she's already not super comfortable in the travel cage), or end up having a heart attack haha. But she really needs to get a shower!