Improving Finger Friction

Hey there, I've tried a few decks and I always run into the same problem. If my fingers are clean and dry, they just slide right off the cards, making it really hard to get a good grip without messing up the rest of the pack. I've tried the old trick of licking my thumb, and it works for a bit, but it's not exactly professional or appealing to do in front of an audience. Is there a better way to deal with this?