Dip the dog in cornmeal juice (1 cup of whole ground cornmeal per 5 gallons of water) and spray the coat with Bio Wash.
We have several reports that mange has been controlled with cornmeal juice dips. In this case the solids don't even have to be strained away. Use about one cup of whole ground cornmeal or horticultural cornmeal per 5 gallons of water. I also agree that garlic powder added to the food is important and as well as apple cider to the drinking water at 1 tablespoon per quart.