Sandblasting inside trunk and hood?

No way. To use the dry ice media to blast underside of a hood or deck lid would work but even then there are soo many hidden areas that cant be cleaned. Any other media will rain from these areas forever and ever.
My uncle (old timer body man) says ther is no way to seperate the understructure from the skin and put it back again without warping the skin.
I think I've figured out a way to prove him wrong. I wont go into details before I try it.