Ear mites😩

Okay so a little back story I’ve had my purebred blue heeler since he was 4 weeks old. When I got him he had the worse ear mites I had ever seen. Well we got them cleaned out and we cleaned his ears with special cleaner and all. But it seems that no matter what we do we can’t keep rid of them.. he has super sensitive ears so I can’t clean them often..

I really need some advice.. what products or tips do you have? My poor baby boy is miserable 😓

Also he’s a little over a year old now and I’ve yet to find something that works to keep them gone..