I have 6 girls that we let free range during the day. They have a 30x20 area in the yard that we have fenced off for them. It is shaded with a big tree. I'm having issues with flies around my run and coop. We clean the inside of the coop weekly and I rake the sand that they have dug up around the run to mix it up. No matter what I do, there are always flies and a particular smell. Searching for ideas on how to keep it cleaner for my girls and for me.