i got it in both my huts and my rabbit run this summer, what i did was move all birds and rabbits into one shed, this was cramped but it was only for a short time.
power hosed the other shed, coated in diatom, 2/3 times a week for about 2 weeks, (during this time i was treating the birds and rabbits in the other hut),
them moved the birds into the other hut and gave it the same treatment, all the time treating the birds to stop any mites reinfesting the cleaned hut.
Touch wood i havn't seen any since