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There's a trick to using bread to clean the grinder. I use slices that I've let sit out for 2 days and get good and dry. They won't get gummy and you'll have bread crumbs for use later. I use my coffee grinder strictly for grinding herbs and spices. If I know I'm going to need bread crumbs, or I'm just getting low, I'll leave 8 slices of bread out. My grinder tends to stay fairly clean.