I can’t hear as well through my plugs anymore. They seemed to have clogged up.
To prevent this you should rinse your plugs in fresh water after each use or as often as possible. It the plugs have clogged up, you can place them in warm water (ca 40 deg C) and leave them in for an hour or two, which will dissolve the salt crystals. Rinse and hearability should be restored. To go one step further you can clean the mesh using a soft brush or cloth after having soaked the plugs in warm water which will eliminate any remaining salt crystals.