Routinely clean shaft with towel/paper towel everytime you get a chance. When you wash your hands and dry off with paper towel use that to wipe down shaft. I use Q-Wiz when I need to get it feeling slick very quickly, I use the multi-colored micro-mesh things every so often - and when I really need to get the thing CLEAN... I use Mr. Clean Magic Eraser and some 91% Alcohol. From what I understand (and it makes sense) if you use water it's going to seep into the shaft and raise the grain, if you use Alcohol (the higher volume the better) it dries up to fast to raise the grain inside.
Hope that helps.
Hope that helps.