Well for me it’s already invented I just haven’t got one but a pressure washer for our coops we are going to either have to borrow one from a neighbor or buy one soon because our coops are getting messy is there something like craigslist you can search, sometimes they’re giving away free stuff maybe you can find a rake there
I finally broke down and got a pressure washer a couple of months ago. It was the best purchase ever! I have ducks, not chickens, and the pressure washer works wonders. No more scrubbing. No need for potentially toxic chemicals. 10/10 recommend!
Edited to add (after reading concerns from others re: moisture) - I mainly use my pressure washer for the pools and things that can be left outside in the sun to dry. I only use it inside on “perfect“ days that are hot and breezy, when I can open all the barn doors and let it dry out. I pressure wash first thing in the AM, and all is dry by the time they go back in in the PM.