We have a 10 x 10 coop with 25 chickens in it. (They are 15 weeks old. The average temp outside is 32 during the day so they stay inside all day.) We use pine shavings to cover the floor. We clean it once a week because the poop builts up and it starts to smell. Do we need to clean it that often? What can we use to help with the smell? Thanks for your advice!