My run area has a covering so I figure it keeps them in and predators out. We have several hawks in the area even in town so I feel better having a roof.
2 Australorps and 2 Buff Orpingtons
I wash before using and that is about all. If really dirty, I know it's time to clean up the nest ( and I will wash those. I just use them first most times. If I give eggs away, I put a sticker on the egg carton that says "Wash Before Using".