Thank you all for your input. I also have this problem. I have used DE in with wood ash in a large size black rubber 6" deep pan, and 3 of the five girls use it sometimes but prefer outside dirt "bowls," so I throw a few handfuls of DE it. I have never seen our boys dust anywhere. Can I dust them with DE? I think I should. I plan to gut the coop and dust all the boxes, replace straw, dust that. Here is my worry and concern: We are ten days in on a sitting hen with eight eggs. I am desperate to do this when It stops raining, BEFORE the babies hatch. Their lungs are so small and new and sensitive to EvErYtHiNg. It will give the coop time to settle down. I want to get two dustings in 10 days. Can I wet wash/spray something, let it dry(24 hr.) then dust everything and everybody of every chicken, mom too. It is raining, and they had to go in early. I free range. So I was sitting on a milk crate just agreeing with their complaining. It felt like one of my hair fell on my hand. Not hair, but the was something tiny, black, and moving. I couldn't kill it with "rolling" it. So small, very small. No, not a flea or tick. About the size of one of their legs. Very small. I'm pretty sure its a miteI'll do anything for my chickens. My husband said they would follow me off a cliff. They love me for sure but not off a cliff love. They are not stupid I talk to them all the time. I wish they could tell me its bugs, not feather quills. I feel so bad for my kids and babies are coming. Got any ideas?