I use a 50/50 solution of apple cider vinegar and water once a week to clean out their ears. However, if it's ear mites I'd suggest a visit to the vets ............not sure cleaning will get rid of ear mites, but I could be wrong!!
You guys never cease to crack me up! Thanks for the laugh...
Back on topic:
You will want to make sure they are ear mites. I wouldn't treat unless I knew for sure. If they ARE, neem oil (just a drop) will do it