I very seldom clean but when I do, I take the long tube protector from a carto and slide it on the atty from
thread end about 1/4 in up. I drip in a few drops of H2O2 and then 'pump' the bottom of the protector to slush it up and down. Repeat a couple of times, then blow out good,
vape off a little steam without inhale, then load her up and go. Sweetens attys up like new.
edit: 91 percent alcohol works well also. To dry, find something to hold you atty with and blast it with a hairdryer. The alcohol evaporates pretty quick.