I never fret too much about the Lee pots dripping. Both of mine drip - recently cleaned or not. Both HAVE been cleaned thoroughly, after running into some funky "alloy" that I wanted to remove completely, maybe a year ago now. I cleaned up the metering rod noses as well. I don't think it's "dirt" making them drip and I don't think twirling the metering rod gets rid of dirt that isn't there, so I don't do it - because it's never worked for me.
I actually made an attempt to lap one metering rod to fit, using valve-grinding compound once. It made no difference at all.
My 10# pots leak as the metering rod begins to "walk" radially, twisting so that the notch in the rod that fits the wire bail that lifts the rod are not parallel to one another. As I'm casting, I know I have to fit a little 15 to 20 degree twist into the cadence. Just that light little twist shuts off the drip. I've even intentionally twisted the metering rod a little just to cause it to drip to test my hypothesis and - it made it drip. If t he notch and the bail are not parallel, the rod is held at a different angle. This may well be just how my pots have "worn in" over the years too.
I've done it so long that if I ever bought a new pot that didn't drip, I'd be reaching for the screwdriver every fifth or sixth pour out of habit.