Geoff, salmon arm actually.
We did you pan with glass not soda. soda doesn't take off rust. As the quality of medias improve we use soda less and less. just too expensive for the customer on most stuff. In the automotive world it seems were only using soda on engines now. we have other uses for it outside of car stuff though. any of the glass leaves it ready to primer right away with no prep
currently were using Soda, Walnut (60 grit), glass (20-50 grit , 30-60 grit , 50-100 grit, 100-200 grit and 300 grit) aluminum oxide, red garnet (80 grit) and a couple new ones hopefully next year if we can get a reasonable shipper.