Just cleaning won't kill them.The chickens are out of the house .they have been out for a few weeks now .my cat sneaks into the chicken area to watch them and since she started doing that is when we started seeing the pests .I thought they were fleas at first from the cat but up on further investigation ( online) I now believe they are mites. My chickens are free to roam the yard and they have a coop where they sleep .we have a lot of doves that come to visit (eat the chicken food) so I think that is where they came from .it is concerning that they have survived the amount of cleaning we have done.