So this is more of a restoration project and not new production? I used the term paint to encompass the clear coat you referenced. What it now sounds like to me is that you are more interested in just cleaning the parts using media blast. Depending on the nature of what is on the surface, you may need to try different things. I suggest you start with 80 grit aluminum oxide at 40-60 psi and increase pressure as needed. If this finish is not what you want, switching to a finer media and/or lower pressure would be the next step.