When ever it rains around here the chickens run gets muddy and disgusting. Half of the run is covered and thats where their food is, but sometimes they scratch the food out into the uncovered part and when it rains the mixture of their feces and the food creates an unbearable stench, any way to prevent this? we will soon be covering the other side, but for the mean time does sand help, or is there any odor neutralizer? Thanks