Would DE work. I use that stuff for everything and it seems to help everything. I received a goat that was infested with Lice. I spread powder all over him. Then the chicks started cleaning him of the DE and the lice I guess because they always pecked on him. The lice was gone pretty quick.
the op indicated use of DE has been ineffective which seems to be a common trend in DE comments, nobody ever has any proof that DE benefits anything and most DE users claim that it is more preventive and is ineffective as a treatment for infestations, I personally don't believe it is a preventive either or all the users wouldn't get infestations to start with.
One thing that did catch my interest lately is the use of predatory mites which kill the other mites however I haven't found research as to whether its effective on chicken mites and I doubt they kill the lice
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