Boy am I itching and scratching right now! Actually I am, due to blooming little grey mites, currently walking over my screen too as we speak. I think someone mentioned before they are dust mites, problem is I'm not sure where they are getting on me. It could have been from goat shelter (where chickens go too) or my feed shed where I have put a bale or two of hay.
What kills them? Also reference red mite, I have moved to mainly plastic houses but latest one has wooden perches!! Guess what, heaving with mites on the ends and under plastic nest boxes. No more! Painted with creosote, haven't checked but doubt they survived. Sprayed whole house.
I agree easier to clean and treat but they still get in. solway houses might not be best design but have never had a problem with them.