The medirabbit page on ear mites (a trusted source, but also content warning, there are some pics of very severe cases: http://medirabbit.com/EN/Skin_diseases/Parasitic/earmite/Psoroptes.htm) recommends cleaning the environment by vacuuming first and then treating with a boric acid treatment:
“Ear mites can fall off and contaminate the environment. While treating for mites, careful cleaning of the cage and environment is recommended. Treatment of the environment is important (boric acid such as Fleabusters®; Vet-Kem Acclaim Plus® – Sanofi; Staykil® – Novartis; Indorex® – Virbac; acaricide spray). When treating a carpet, vacuum first in order to further penetration of the spray or powder. Shampooing and steam cleaning are not ideal; their residual humidity can increase the mite problem. During treatment of the environment, rabbits should be kept in another part of the home to avoid the danger of contact with the products.”
If you were concerned that you didn’t quite get the environment super clean, I imagine you could also continue the treatment for longer than you need to make sure the mite life cycle is completely broken.
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The answers provided in this discussion are for general guideline purposes only. The information is not intended to diagnose or treat your pet. Seek the advice of your veterinarian or a qualified behaviorist.