Has anyone ever tried using soda blasting as a way to remove paint inside a cave? Soda blasting is a environmentally friendly product. Only bad thing is, that you have to clean it up with water..... Which I guess isn't a bad thing if the cave has water running through it since the soda will not hurt the eco system in and around the cave..
If you or know of anyone who has used it, can you tell me how well it worked for you?