Drag them down the beach...
Agreed. Sharp sand and a cement mixer works great for cleaning up truck chains that have rust from salt on the roads. Just be sure to wire the ends of each three railer together so they don't tangle.i worked for Dupont for a while and the riggers on that site were quite particular about their equipment being clean, they had a cement mixer ( Electric ) that they had a little sand in, throw the chains in there, start her up and in a half hour the chains came out lookin new.
Tim