Hi looking for some advice. I'm planning my coop and am converting a shed to my new chicken coop. I cleaned out the shed and found lots of rat carcasses and d-con rat poison. I want to make sure my future chickens are not exposed to the rat droppings and rat poison so I'm looking for a way to clean out the shed. Can I use a power washer with bleach? It will aired out by the time I get my chicks. I just don't want to use anything that might be harmful to them.