Had Level One Restoration dry ice blast the undercoating off the underside of my 69 SS 396. Good reference pics.
https://www.yenko.net/forum/showthread.php?t=170033&page=6
Hershey Foods used dry ice blasting on their conveyor lines. It's considered food grade and does a great job.
It's used in fire restoration on charred and smoke infused wood, in combination with a large - at least 8"- 10" vacuum, it would take at least 3-5 hp fan /bag house to pull enough draft over a tube with a 8" dia to remove debris, from within 10 feet from the source - but that would be the ideal way to do the big jobs.