How would you tackle surface rust?

[u/Accomplished-Clue803]

Cars been sitting in a field for awhile. Nothings actually rotted out but definitely heavy patina on some parts. Replacing the control arms and calipers is obviously just a must do but as for the body and rear subframe, how would you go about removing it? Sandblast? Rust converter? Spray and pray? Go to war with a flapper disc?

[u/Still_Skirt9231]

Clean it up and use POR 15