the cleaning I know....how you talk this damn thing apart, and get the lint and dirt out, I have no idea. Seems like it was one screw, and the rest are pins. Thought I read someone else do this at one point, but can't seem to find there post. Anyone?
The only tricky part with the 630 is that the scale screws are screwed into the standoffs from both sides. So, as you unscrew one side, you are tightening the other side. You will need a pair of padded pliers, or something to protect the standoffs while you hold them and unscrew the second screw. Other than that, assembly/disassembly is straightforward.