I found the dark yukky goo in my little girl dogs ears a few weeks ago. Its sorta stinky, too. Had another dog, awhile back, who had these symptoms. Took her to the vet and found it was yeast not mites. Thought about it and, after cleaning out as much yuk as I could, put castor oil in a small bowl, added quite a few drops of detoxified Iodine and mixed it all up. Took q-tips, dunked it in co/iodine mixture and lined the inside of her ears. Looked again in a couple days. Yuk still there but not so much. Did the same thing. Cleaned her ears and used this mixture a few times. It took a little bit of doing (time) but her ears are well on there way to being healed. Just looked last night and hardly any yuk but still a small amount. Will continue on until no more yuk.