Well, I've done a few myself and I don't dip parts unless it's a cast iron cylinder head. I don't have any experience with dry ice, but the concept sounds good. I will use sand or bead in selected areas and my favorite method is a homemade contraption modeled after one patented as the Vacu Blast.
(that's not mine)
I thought about buying a tub once from the premier fabricator Urs Gretner. His preferred method is hand stripped and touch blasted.
Sure, any blasting is messy. Have you seen how much crap flies around with the wire wheel? It's all a dirty business; strippers, blasters, wheels, etc.
BTW, if I understand Mark at all, this is why he doesn't post on the tech forum. Too many comments from the peanut gallery. He is kind enough to show us his interests but has no need for the extended conversation.
Sorry, Mr. Mark.