I don’t know if this would apply but my husband had hearing aids for years. They spent most of the time in the bedside drawer even though they cost thousands. One day,recently, he went for another ear test and the audiologist told him his ears were very blocked. He had to put special drops in his ears for a week and then he went to have them vacuum cleaned. They sent him home again to put more drops in and after another couple of days he went back. This time they managed to clear his ears, a lot of wax,flesh bits and goodness knows what yucky stuff came out. Result was he can now hear reasonably well( just slightly down from normal )and he no longer needs to wear the hearing aides. Yay. It’s been several years.