MSD said that she thought Hoodat uses campho phenique for ear mites. Do you put it in the ears or behind the ears like the ivermectin? And how much should I use? Also, can you use DE for ear mites?
I'm not sure of the proportions, but AmysMacdog's recipe sounds good to me!
I haven't ever tried DE for ear mites. I'm sure it would kill them, but I am afraid it would be very drying to the inner ear. You can rub some into the fur around the base of the ear and on the outer ear itself in case they try to crawl out.