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I've used a sand blaster at home and work, they will do the job on the castings. The sheet metal parts will get badly pitted and tend to warp, though. The blast media acts like millions of tiny hammers hitting the surface. It sure cleans a casting, but the thinner sheet metal will distort, in my experience.
Prepare to clean up a mess if you use one of the $20 guns from the hardware store. Blasting material goes everywhere unless you have a booth to keep it contained.
Will write more later,
Dan
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