what i do is i give each chicken ivomec paste- its a horse wormer, a pea size bit for each bird- it will kill mites- in extreme cases i bathe them in flea dog shampoo also, powder them when dry- and of course i either bleach out the coop, roosts, any cracks in the wood- or spray it down with permithrin spray- its a constant battle
ROBIN-..its a conspiracy! they have stolen my heart, so have cochins, silkies and seramas and ......if its fluffy i just may have it !! !