I once had some ferrets that had ear mites, and I tried the oily stuff
that goes in their ears.  I had limited success, on account of the
squirminess of the guys during application.  Then one of my vets gave
them each a single subcutaneous injection of _something_, I forget the
name of it (help me out here, pre-vets!).  No more ear mites.  The stuff
was incredibly effective.  Assuming that there are no nasty side
effects, I really can't recommend using anything else.
 
- Anon.
 
[Posted in FML issue 0462]