I've had chickens for all of four days, and wonder how/how frequently I should clean the coop. I had an "extra part" after building my coop from a kit, which I realized was the roosting bar. I installed that yesterday (after three days) and the chickens seem to be using it. Prior to that, they mostly laid in the bedding, which is straw. The straw sits on a board, which is removable. However, when I try to remove the board, the straw bunches up and prevents me from removing it. See the attached photo. What's the best way for me to keep this coop clean?