A.G.
Some dogs just have a lot of junk in their ears so you can just clean them out with a cleaner, but if he's scratching or shaking his head a lot or if his ears smell bad and pussy he has an ear infection. If he's had ear infections in the past and you just recently brought him to the vet, you could probably just give them a call and they can give you some cleaner and meds, it depends on what his visit was and when. The cleaner is spendy, but it lasts a long time. I've been a vet tech for a few years and people who have used over the counter meds don't seem to have any luck with them, they end up coming to the vet anyways. Well I hope I helped a little. Good luck in what you find or do.