Wash your clubs. ;)
This seems to have a couple of beneficial effects. The first is the practical one of course. With a clean club face you are presented with more consistent precision in how the ball is going to be launched from your stroke. The other effect is the placebo one. You feel better with shiny clean clubs. If you play or at least have tried you know golf is a mental game. The second point also plays off the first one. If your game is consistently better from a clean club face naturally you'll have more self confidence to play even better. So when in doubt... wash your clubs shooter.