All my chickens are gone now. Want to prepare the coop or new ones. Had 10 chickens were pecked each other in the backside area and all died. Never figured t which on was doing it.. I felt really bad for them. Checked them for bugs. Could not find any. All I thought I saw was dirt. I want to treat the coop before I put the new chickens in it. Questions 1.How do I clean it and prepare it? I will get ALL cobwebs out. Plan on putting in new roost and nest and any walks they use to enter the coop ones outside and inside to the floor. I have a concrete floor and about 6 inch concrete sides then wood for walls. The rest of the coop is all wood. it's a converted milk shed. The first time I had 6 chickens had NO problems. I cleaned the coop out before I got my second batch of 10 chickens. These last 10 chickens were peace full in the brooder. They were golden buffs and suppose to be docile. I put them in the coop at the proper age. As they grew older they began picking each other backside drawing blood. So I don't want that happening to the new ones I will get. I don't know if the coop was to small for the 10. the coop is 10 by 14. So I want to clean the coop extreamly well this time. So what do I use between the cracks and crevises to kill anything that might be in the coop. I plan on getting 8 females this time. Any information will be greatly appreciated.