Likely a yeast infection - black, gookey and smelly. Daily routine until the ears are cleared up: Nolvascan Otic cleansing solution, squirted into ears, leave for a couple of minutes and clean out with a cotton ball. Also: Call your vet for a prescription for Otomax and follow the directions. I’ve got two Goldens with nice clean ears.
Exactly what we do, right down to the brand names.