I've seen these machine used to remove mold on wooden surfaces of homes used as "grow ops", it removes a fine layer of wood fiber along with the mold to expose fresh uncontainminated wood surface.
I would be worried with soft materials such as drive belts or plastics under such pressure, but it will be good to clean caked on dried out oil and grease accumulations on hard metal surfaces such as shown on this link [ame=http://www.youtube.com/watch?v=ZrHchu1tNyc]Dry Ice Blasting- Engine Block - YouTube[/video]
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