I had an itch mite a few yrs ago, I tried everything, cleaning everything, borax in wash, different baths,,, But the only things that worked was "Blue Dawn" org. formula as strong as I could stand it in a hot bath, maybe a TBSP full, more or less? (Be careful, it could burn a bit), but after about 3 baths I saw tiny black things exiting in hurry to get off me, on my way out of the bath!
I still had some issues afterward but 3 doses of horse Ivermectin internally finally cleaned up the rest, and I was cured!