OP, you have got some good advice from this thread!
Here's what works for me...
Get a hair clipper, one from
walmart for humans for @ 14.99 is fine. Use it without the attachment & trim the hair all under your dogs ears and on the ear flap. Air circulation is key to dry up any moisture that gets trapped in the ears
Switch to a GRAIN FREE dog food. Yes, it is costly. BUT I have found, with my goldens, that they get the itchies and a lot of ear infections when they were on food that had corn and a lot of additives in it....There are many many different options out there. Costco has an excellent grain free kirkland brand dog food we are currently on & it doesn't break the bank.
Fish Oil pills & Flax seed oil (or pills) Not only is this healthy for your dogs heart & skin/coat, but, it aids in the health of your dogs ears. I use fish oil pills from costco ( my golden gets 3 a day in her food ) and flax seed that I shake onto her food as well, and sometimes I use the flax seed oil from a bottle. I get the flax seed from my local supermarket, when they have the vitamin & supplement 50% off sale..... You can use human grade fish oil & flax seed oil, it is exactly the same as the expensive "dog" ones.... Most dogs gobble them right up when included in their food...
GOOD LUCK!! Oh, one other thing I do is basically keep the ear infection medication ( and ear wash ) in the house at all times. When I do go to the vets I ask for refills, so I don't need to go running to the vets office & get hit with an office visit EVERY TIME we get an ear infection...By now you know what they look like & how to treat it!!