Depends on what you're trying to clean. Is it rusty inside or just gummed up from old gas? It makes a difference. Good Gerry cans have a lining. If you're trying to get old fuel gum out then using abrasives (chain, rock, media) will damage the lining. If it's rusty then use a piece of chain and shake it vigorously until all the scale is gone. The inside of the can will then need to be relined.
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