I blitzed my sheds this weekend. Turfed everything out, cleaned into all nooks and crannies with stiff brush. applied that diatomaceous earth liberally to all crevices etc. replaced everything. added some of that pink powder, i think it's called stallesan e or summat? new plastic sheet on floor and some shavings. then sprinkled mite powder as well for good luck, and it smells nice. also did some running repairs to pop hole and perches.
not sure if it will keep the mites away for long but it cheered the birds up and smells nice, for a while. I will continue to harrass the birds by powdering them, one by one. It's a constant battle, but we all have to do it.