I have a EJ DE89 razor that I have used for probably a good ten years. I know there are tons of videos and threads on razor cleaning but think my problem is a little bit different. For awhile now I have gotten the impression that I might not be getting the head snugged down appropriately. I think the problem may be what I believe is calcium build-up on the threads; I am meeting some resistance when I am closed to getting it completely snug. Cleaning the razor by soaking it in Dawn dish soap, then using an old toothbrush, drying and buffing it is my usual routine, but tht doesn't seem to be getting the deposit of whatever it is out of the threads. I have taken to using a brass brush on the threads but I still have a white buildup in the groves. I don't have a tap-and-die set to use on it; I mostly just power the thing closed closed trying to clean the threads just with the screws in the head. Last time I cleaned it I used Scrubbing Bubbles, but that didn't seem to help. Would very much appreciate some suggestions. Last resort, of course, would be to just buy a new razor, but I am cheap!