I have a poop board under my roosts. A thin layer of PDZ. I clean it out once a week. No problems. I have 12 chickens.I have poop boards under the roost and clean off daily, it only takes a few minutes, it's so easy.
Some people leave it for days/weeks then it becomes a chore, next time you go to the toilet don't flush it for a few days or even a few weeks lol.