So I've had my Slim for a couple of months now, and when I first got it it was extremely easy to tighten and loosen the doors. My problem is that it is getting progressively more difficult to twist open and shut. I wonder if it is just the water and soap scum getting into nooks and crannies and clogging it up, but I'm not sure. It isn't a big deal at this point, but I'd like to keep it in solid condition, and would like to know what I can do to keep the doors twisting freely. I cleaned the razor with scrubbing bubbles a couple of weeks ago, but this didn't seem to help. Advice? Can I just shoot some WD-40 up the bottom? Any other ideas? Thanks gals and guys.