About a month ago I took my cat, Callie to the vet because she was scratching her ears a lot and the vet said she had ear mites. She put this Revolution stuff on her and said that would take care of the ear mites, but since it had gotten pretty bad, we would have to clean out her ears 2-3 times a week to clean out the excess ear wax. So she gave us this solution and some droppers to use, and we've been cleaning her ears about 3 times a week. I'm still worried about her though, because she still shakes her head a lot and scratches at her ears. From what I can tell, her ears look clean, but I don't know if there's stuff deep inside her ear or what. What else could be wrong?