@tmckinnie Here are my thoughts. If the stuff is coming from the ears, it's probably dead skin. You may want to try using a very small amount of mineral oil or a product that @arieswoman recommended in a previous post. Maybe she'll chime in to mention what that is. How about environmental factors such as dust? Combined with humidity, and after time, these will build up even though we think the hearing aids keep particles out. Ear molds have vents so they are not barrier proof.
Tony in Michigan