We have a big one we use at work for cleaning machinery, they just got it a few months ago that thing is amazing! It was originally purchased to clean some new cup lip rolling screws for the new machines we got but have since been used for complete cleaning for thermorming machines and now this week and next week we will be using it for cleaning up all of our extrusion sheetlines to remove all the grease, plastic condensation oil, and bubbled paint so we can skin it all with stainless. With how good that one works with the nasty stuff we use it for I would imagine a small one like this would work wonders on a car. You would never be able to use ours on a car though, it would literally rip a hole right through the dash. The main problem I see with this setup is that you also have to source a local supplier of dry ice, of course the smaller amount ordered would be a higher price, and you can't order too much or it will evaporate before you get a chance to use it. We have had that happen a few times, we order it in large coolers, I would guess around 200lbs or so all in pellets. A few times we didn't use it for a couple days and when we opened it up there was a brick in there about half the size that it originally was.
The thing is pretty cool to use, but I just don't see it being worth the price (unless it was dirt cheap....) for anything other then a high volume shop that is very concerned with water usage.
