Hello! I have DE but don't know how to most effectively use it (as in how much per square foot etc), I have at least two bags of shavings down inside my chicken house and still with the flies:-( Ho woften should I clean it all out? Also I have found mouse droppings near the food?!?!?!?!? How can I prevent mice from stealing the food??? Any advice would be appreciated. If at all possable I woul dlike VERY inexpensive solutions as we are broke THanks a ton!