The dry ice cleaning process uses pellets that are made through a process of taking Liquid Carbon Dioxide (CO2) and expanding it to produce a snow like substance. The pellets are then propelled by a compressed air gun and upon impact; the dry ice creates a micro-thermal shock (caused by the extreme cold temperature of -79º C) which breaks the bond between the coating and the substrate. The high pressure air stream removes the dirt from the surface, while the dry ice pellets vaporize.

Image supplied by Air Liquide UK
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