I did a restoration and had the body walnut shell blasted. It's really gentle on the metal, and doesn't warp any panels. A little vacuuming and you're cleaned up afterwards. I've heard too many horror stories about chemical dips, and not getting every bit of chemical out. Scares me to think of paint lifting because there was chemical left in some unseen spot, or "out gassing " of the chemical. My opinion only, walnut shells is the only way to go!!! Good luck.
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