Sandy

Hi everyone,My cat has had ear mites since about a year ago when we brought him home from the shelter. We took him to the vet and she diagnosed the ear mite problem and put him on Revolution. But that medication hasn't worked. She told us to put it in his ear once a month. I thought I read in other places that it was once every two or three weeks or something. I sort of do not trust vets anymore, because of an incident my fiance had.So we bought some ear mite medication at the pet store called Bio-Groom. We decided to use up the bottle first before we bite the bullet and take him to another vet. Haven't finished the bottle yet, and there appears to be more black stuff in his ears.Does anyone know what this means? Or any other advice for ear mites? We clean out his ears (if there's gunk in them) before treating them, with mineral oil and cotton swabs. Thanks! Sandy