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Pennies work good with their sharp little edges for breaking loose rust deposits, enough weight to them to be effective, and being copper they won't create a spark and so can be used in tanks or cans, even with some fuel still in them.

Any chemical treatment will leave residue in seams that's difficult if not impossible to remove; sandblasting... some sand will always stay long enough to be carried into your fuel tank/in-tank fuel pump. Here's a trick that works well. Get about $5.00 worth of loose pennies, put in can and...