I've dusted 3x now with poultry dust containing 0.25% permethrin with NO luck. Really, no change what so ever. Dusted once then 7 days later. I looked at all of the hens and the roo and they were just as infested as ever three days later.I've read on post to try adams flea spray for an instant kill on the birds then spay the coop with liquid seven. Can we still eat the eggs or do we need to wait a period after treatment. I'm about to pull my hair out over this.