I have a very difficult coop to clean and we live out in the country but our chickens are not free range do to other animals. I usally clean my coop 1-2 times a month and in the 5 years since i have built it i have only power washed it once and my chickens seem fine, but i have tried using wood shavings, straw, sand that you would find in a horse arena, and just hay. I think what works best is the wood shavings because it soakes up any extra water. It also is very easy to clean up. Before i put the bedding down i usually put mite powder down, a chicken coop deodorant and a flea spray in the coop. Then when i put the bedding down i put another thin layer of flea spray and mite powder down