I used paper towels for the first few days then I went into my sandy backyard, got a bunch of sand, and used that. Best decision I could have made. As for super cleanliness...just like kids, we are NOT helping them grow an immunity to things by keeping them in a germ free bubble. This does more harm than good. If they were being raised by their mom, they would be pecking at dirt and poop and sleeping all over the place. While I agree it is important not to have chicken poo covering the entire floor or the ammonia smell so strong it knock you off your feet...they are chickens and we should not be trying to keep them germ and bacteria free. They will need that immunity when they head outside.