flowers of sulfur is another name for elemental sulfur. https://www.amazon.com/dp/B00HARCM7K/?tag=backy-20I read about something called flowers of sulfur that is good for this mite. Have you heard of it? I'll look into giving him a bath. I'm hesitant to do anything too hands on with him bc he screams in pain. I think his feather loss is painful for him.
I have a "poofer" I use to dust the birds with sulfur. a plastic ketchup/condiment bottle or turkey baster would work. https://www.amazon.com/dp/B01LRMN9ZM/?tag=backy-20
I put 1lb of sulfur to 10lbs of what ever dirt/sand I use for a dust bath to help prevent bugs... I poof the coop and birds that can't/don't use the dust bath