I have a Dillon 550b that I have had for years. The hopper on the powder measure is on its way to becoming opaque from leaving powder in it. Has anyone found a way to return it to more clear? Don't suggest a powder sensor (about $50), inasmuch as I want to get suggestions from people who have "fixed"/improved theirs before I go the sensor (or new hopper) route. If it can not be done, of course I will have to go to the alternatives.