DE is good for many mites and lice, but doesn’t work well on scaly leg mites because they burrow under the scales of the legs and feet feed. The mites excrement raises the scales on the legs. Gently rubbing oil into the legs and up under the scales kills the little buggers though. The scales don’t always return to normal, but the chickens are definitely happier once they’ve had a few treatments.
The chickens I’m treating have not been handled much, but they are becoming more accustomed to it, some even seem to like the treatments now. I’m using plain Vaseline mixed with mineral oil to help it flow under the scales, but so it’s more of a solid to apply at first. Seems to be working well. Coconut oil would be a good base as well if you want to avoid the petroleum products, but I used what I had on hand