How do you strip your sheetmetal?

Soda Blasting
Chemical stripping
Sanding
Sandblasting

If you sandblast do you use sand or another compound?

If you use soda or chemical, what do you use to get the rust off?

My cab has some surface rust on the roof. I don't want to warp the metal with the heat of sand, but I want to remove the rust.

Thanks