Post Soda Blasting surface prep

Originally had my frame sandblasted and powder coated for my truck and that turned out fabulous. Then I had the cab sand blasted and what a nightmare.. I have blown it with air and vacuumed dozens of times and still get sand drizzling out...
From now on anything that's enclosed like that I'm just not going to have sandblasted but if it's open and no pockets for sand to get into I'm good with it...