Gotta let it drain slowly. If it gets stuck, whip out your giant spoon and scrape the spoon gently along where the braid is on the bottom. My braid gets a bit smoooshed toward the end of mash out, I just close the valve, stir a bit, then open again. It's just something you have to get a "feel" for... The more I try to rush it, the more irritated I get when the draining gets stuck.