Dry ice blasting machine - GIF

[Moby Duck]

I once employed some contractors to clean the inside of a ships main supply generator using this dry ice blasting. Generator windings were heavily contaminated with oil and carbon dust that had accumulated over about 20 years of use. It was a great success, the insulation was not damaged, and generator did not need to be disassembled. There were concerns about whether the CO2 would accumulate in the bilge and also about where all of the removed oil and gunge would end up. Gas levels were monitored but there was no measurable accumulation and it was concluded that the gas and contaminants were removed from the area by the ships normal ventilation system. The whole job was clean and fast and much better than washing out with toxic solvents. One large chilly bin of dry ice was all that it took to complete the job.