Has he not been professionally treated for mites? Trying to pick them out at home like you're doing will not work, and you can damage his ears inadvertently if he jumps while you're in there. Get an anti-mite medication like ivermectin or selamectin from your vet. Once the buggers are dead you can go to work cleaning out the, er, remainders.
Listen, I had ear mites once (I think I must have flicked a chunk of debris at my face while cleaning and they got in my hair and wandered into my ear...) Anyway I would hear these disgusting chewing noises at 4 am -- the point being that mites are not fun and you want to kill, Kill, KILL THEM ALL immediately! :wink: (Since I only had a few I killed them by drowning them in sesame oil...it did seem to work, no more excavation sounds after that!) But in a heavy infestation, mineral oil is penny ante, go for the drugs baby. I am holistic about most things but when it comes to these buggers, I just love modern chemstry!
Cheers,
Dr. Jean