My parrots enjoy showers when the want to.
My military goes crazy for them, my grey likes them 50% of the time, and it's a hit or miss with my B&G macaw. I take all three into the shower at once though, and have multiple shower perches in there for them.
The previous owners of my military used dish soap mixed with water to give him showers with, but I figured that can't be safe! So instead, I mix aloe vera juice with the water. Aloe vera is good stuff! You can rub it on their skin to heal cuts/sores, you can use it in showers for them, and you can even give some to them to drink.
I wish my grey liked showers more than he does, though! He's the dustiest bird out of all three of 'em.