Dry ice blasting a chassis - GIF

[fizzloid]

There is a company not far from where I live in Germany that makes these dry ice blasting machines, I got a demo of one once for my company. They poured large bags of dry ice into the spray machine, it came out the nozzle as a very high speed powder which disappeared almost immediately.
Works great, I watched it strip some pretty heavy rust, dirt and old paint etc.from some old farm trailers and ploughs they used for the demo. There was very little residue or mess to clear up afterwards, really only rust flakes and dust. Dry ice is not too expensive, and easier to haul around than heavy CO2 tanks for smaller jobs.