My very nice Hudderite farmer friend who raises my Thanksgiving and Christmas turkeys for me got me a 50 lb sack of hard red winter wheat when he heard I ground my own grain for breadmaking. The catch is that, as I was thanking him profusely, he nodded rather sternly (he's a rather stern man who I believe is marshmallow in the middle ) and said "It'll have to be cleaned, though." Uh... okay. I normally buy my wheat from a large organic outfit, comes in heavy paper sacks, and I pour it directly into my mill. No cleaning involved. My question is, what do I do to clean it?