I used it with very good success for a terrible mite infestation. It smells great. New Puppy Smell.
I dilute about a teaspoon of it in a dishpan of very warm water, it makes lots of suds. I soak the whole chicken in it for several minutes, just keeping their airway clear, using a soft "complexion" brush to clean the face and the naked parts like the feet and breast. I use a cup to keep pouring it over. You can see all the dead little bugs falling off and back into the water.
Then I rinse a long while with a hand held shower and blow dry the chicken before letting back out, so I can dust the dry feathers with "Garden and Poultry Dust".
Lots of poison, I know. But lately I realize that death is a requirement of life. Its the suffering we can fix, but none of us will live forever. So, I choose to avoid suffering from bug bites.
Certainly, people will have better, less poisonous solutions, so I'll be watching your thread for more! But the Adams dog shampoo worked very well here. Our chickens seem to enjoy a bath and blow dry.