I’ve been there! My old coop was hay in the run and even though it was covered, the rain would come in sideways and it got soaked. After a short time it just gets packed down in the mud and is impossible to get out unless you pry it lose with a pitchfork. Even if you are in good physical condition, this is a very difficult job.
Seriously, my opinion would be contact a local church and see if their youth group needs to raise some money this summer. Get a few of the kids over to clean it out for you exchange for a monetary donation. We live in a small rural area and attend a little country church, but our youth group is always looking for ways to raise some extra money at this time of year.