Do go to the vet. I've used all the usual vet remedies and they work well on one of my dogs. But the other? It's almost like cleaning my girl's ears causes an infection. Ottomax cleaning alone doesn't work, but cleaning with ottomax and a little antibiotic for the infection she's prone to after seems to work.
Also? Do a search for 'Blue Powder ear cleaner for dogs' and see what you think. I've read on the springer forums it's the miracle treatment for ear infections. I've not tried it yet, but I might when I run out of the prescription drops.
Good luck!
Thanks!