The little holes are built into the hearing domes on my Rextons. I keep my ears as clean as possible but the wax still builds up in the tiny holes in about a month. Online, the best price I have seen is $20 per pack of six. So far, I have just been replacing them about one time per month.
I wonder if an ultrasonic cleaner with some type of safe cleaning fluid would work? Has anyone tried an ultrasonic cleaner to clean screens and domes?