I have soaked a short handle super adjustable for over a week in Dove dish detergent and then scrubbing bubbles. Working it all the time, back and forth. I finally got the 1/4 turn lock down to work with rags on the handle and holding head but it is simply still too darn tight. Couldn't do this with a razor blade and use for shaving. Any other tricks other then sending it to a repair facility. I don't want to ruin the black on the handle. Sending it away for cleaning---I'm not sure that's worth while as I paid a decent amount for the razor because it looks very good. I'd like to not spend any more. And, the 1/4 turn lock down just isn't working without pretty good force? I think the soap scum has hardened into cement?