I have a coop built by the previous occupants of my home. I don't think this person used bedding or even cleaned the coop. I've gone in the coop to clean the piles of poop on the nesting boxes and where else I could. Because he used just the natural dirt floor as "bedding", I can't tell what's poop & what's dirt on the floor. It's been at least serveral months since this coop has been used. What can I do to be sure this coop is safe for my hens, when the time comes? The chicks don't arrive until early next week, so I have several weeks to prepare.