Ballerina Bird, don't worry about being "fixy" about anything. I'm still learning this mite control thing as I go along here! They are your birds and you have every right - no, you have a responsibility - to ask questions and make decisions based on what YOU think is best for your flock.
In our case we'd noticed the girls acting fidgety on the roost boxes. But since I have some Littles and some Tinys added to the flock this summer I attributed it to them sorting out a roosting order. I'm sure part of it was that. But last Wednesday we noticed a little red mite crawling on one of the eggs we brought in. I never even thought until that moment that we had a mite problem in the coop. So that night we went out with the flashlight as I described, and yup....there they were, crawling on the roosts. I grabbed one of the girls and shined the flashlight on her. Yup...mites on her too. UGH! On Thursday I spent time doing searches for what other people had done to combat it, and we took all of that information - taking into account that we didn't want to have to the chemical route if we didn't have to. We had to. We went up to Billings to get the stuff I needed to get to work on it on Friday, and Saturday the war began. When we started stripping the coop down, we realized that we had more than just a little problem....we had a mess. Ken took the screws out that were holding the roosts on the studs and there were mats of them under there. <shudder> The crevices in the plywood behind the nest boxes were also full of them. <another shudder> But after power washing the coop stem to stern, cleaning all of the things that we took out of the coop, spraying with Neem Oil, making sure to soak crevices and corners and any place where one piece of lumber met another, then dusting the girls, we saw a difference within two days. The girls were calmer, roosting was quieter, and searching out mites in the dark became less of a major shudder and more of a "Well, we still have some over here so mark this spot and we'll spray it again." thing. We planned on leaving the deep litter in and just treating it, but after we had disturbed the coop so much and disturbed the hidden mites, we saw some on our coop shoes. Okay, out goes the litter too!
@aart , I feel so silly for misunderstanding your question! Sheesh, We used YTex GardStar Garden and Poultry Dust. I ain't always the brightest crayon in the box!