Clean hiding place Here's the difference between a home brewer and a pro: self-cleaning gear. Transcript After breaking away from the BeerCraftery brewery tour unnoticed, Paul finds himself in a special hiding place. Paul: Huh, great hiding place. Nobody will ever find me. From somewhere above and outside: click Water and foam splash Paul around like a piece of laudry. Paul: Today's lesson: A mash tun's self-cleaning cycle thoroughly removes dried grains, t-shirts, and excitement about a hiding place.