WHY IT WORKS
When some of the dry ice penetrates through the material to be removed, it comes in contact with the underlying surface. The warmer sub surface causes the dry ice to convert back into carbon dioxide gas. The gas has 800 times greater volume and expands behind the material, ultimately speeding up its removal. Oil, grease, asphalt, tar, soot, dirt, and resins are some of the materials removed by this procedure.