The overwhelming majority of accumulated poop will be under the roosts, that is where it really builds up and why may people with small flocks will use a poop board under each roost, it catches to poop before it hits the coop bedding and can be scooped out into a bucket daily and kept clean, I have more roosts and more birds and decided poop boards to be more trouble than theyre worth so I just let them poop on the floor and either clean it out or rake it into the rest of the coop bedding and add more bedding. My run is just plain outdoor ground and doesn't really accumulate much poop, what is there apparently decomposes as I don't have any smell from the run nor do I ever clean it so far.