I was advised by my doctor to use ear drops such as drugstores (US) sell over the counter. I bought the Brooks house brand (carbamide peroxide 6.5%) & found it worked fine. One ear got plugged again after a couple of weeks & needed a repeat, but since then both have passed my usual test: Rub your thumb & forefinger gently together next to the ear. If your ear is plugged, you won't hear it.