Was given a steel coffee can full of what used to cast net weights. Not sure how many decades these sat in the can, but the can quit holding water when the bottom eventually rusted through. The rest of the can is heavily rusted, and some of these weights have so much rust on them they almost look glazed. Was wondering if there is a recommended way to kind of clean them before melting. Not sure how much of a mess it will make if I melt them as is. Thanks.