Investigated Dry ice for the stripping of aerospace parts back in the early '90's, great process but the cost was too high. I dont think it would be much good on the undercoating as we had problems getting it to remove pliable sealants. I have also done the acid process (which is usually caustic soda) a couple of times, what a mess as you will have things coming out of body seams for quite a while. It was great it its day but I would torch off the undercoating and get it PMB (Plastic Media Blast). That way it is dry and you have no entrapped mositure.
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