I applied the oil once every day for 3 days then again once a day for 3 days week later. I very gently rub her ear with Q-tips allowing some oil to go into her ear. The crusty came off the first day just a bit, the 2nd day they were 50% gone and the 3rd day completely gone. She was the only one to get them for whatever reason and there have been no signs of them returning so far. Like I said it is very messy and leaves the bun covered in oil all around her ears and neck. She did a very nice job cleaning herself and is now expecting a litter the first week of Feb.