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How to clean chitterlings
Purchase your chitterlings.
You can find chitterlings at some supermarkets or purchase them directly from a butcher. Always buy about twice as many chitterlings than you want to end up with.
Chitterlings shrink when boiled and cooked, so you'll end up with fewer chitterlings than you started with. You'll need to clean the chitterlings even if the kind you purchase say they've been pre-cleaned.