If you poodle or dog with floppy ears has ear problem: infections, with dark, smelly discharge, or other discharge types. Dogs ear canal goes deep, like an inch or two. Make sure when you apply medicine it feels that ear canal entirely. Cause bacteria lives there, if not eradicated from deep down the infection will return after not a deep down  treatment.

Blessings!
wash your hair with baking soda (the same prosess as shampoo), rinse with water with slash of apple cider vinegar.