On a home renovation show we're watching, they're cleaning charred fire-damaged joists after a house fire with dry ice pellets fired under pressure at the blackened surfaces. It did a remarkable job of cleaning it like new, and there was no clean up (other than running an air filter.) Pretty clever! They promised that it would get rid of the smoke smell in the home. It took about 500 pounds of dry ice to clean a room.
As they point out laboriously in this video, sand blasting leaves a lot of mess to clean up, but does a better job of penetrating deep rust that has removed the surface of the metal.
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