Does a clean clubface really matter?

Walk down any PGA Tour driving range and you’ll see players using towels, brushes and tees to clean their grooves after every shot. More than just a mindless task, there is a belief that a dirty clubface reduces spin and creates inconsistent distance control. But does a clean clubface really matter?
As part of our MythBusters series, we tested the effects that clean and dirty clubfaces have on spin. Here’s what we found.