When I was prescribed the neomycin / polymyxin B / dexamethasone (antibacterial/steroid), which is actually an eye drop, my doctor was trying to find something else specific to the ear but it wasn’t available at my hospital system/pharmacy (strangely, my pet is also using this drop for his eye).
I tried most of the things listed in this thread and none of them helped much. Only those drops helped, and very quick (only used once).