Earsolv will get rid of mites in the ears but you will have to put it n the paws as well or he will reinfect their ears when they scratch. The mites live between their paws also. Try Earsolv.com
I have used Earsolv to get rid of ear mites on my Rabbits. It is a natural product and you only need to use a tiny amount of the powder in each ear. It worked really quickly on my rabbits and started to reduce the redness within hours.