I too have watched a few vids on ice blasting, I think I have even read of it being used to clean out inlet tract gunge caused by regs requiring the crankcase to vent it`s self via an oil separator into the inlet tract on direct injection engines..?
I have used freezer spray in electronic applications in past times...
Seem to remember a neighbour telling me he was booking his Skyline in for an underside clean up and the price estimated was circa £10K, plus parts..!!!
