Well, we basically agree, srcowell, but when I drip right into the filler from the mouth end and quit dripping when I see a drop at the threaded end, I know the carto is full at that point, and I really don't have any mess at all (at either end). Then I just do a 1/2 second quick swipe with a kleenex at the threaded end, put the mouth cap back on, and it's done. If I soaked the threads into the liquid, I would have to spend more time cleaning that entire area, and to get the threads really clean, I'd have to put rubbing alcohol onto a kleenex and wipe it all real good (because I think the liquid will gradually build up if I don't use rubbing alcohol). I do use rubbing alcohol to clean all my carto ends and battery ends periodically, anyway, but I'd rather not spend the extra time doing that every time I fill cartos (which seems to be every day - about 12 cartos usually).
As it is, I go through a lot of kleenex and q-tips every day and spend a lot of time with this obsession. I won't have that kind of time from January 15th through April 15th, so I think that's the main reason why I've been constantly trying to come up with the fastest methods of doing everything.