Hi everyone, for ss I got an old beat up sheridan df body and grip frame(you rock santa!

)
It has a ton of surface rust and corrosion on the body and frame. Also the insides of the frame are rusted and the lower tube is aswell. The barrel bore is in good shape.
I want it to be shiny, and functional. Do I sust sand the brass and polish with brasso? What do I do about the frame?
Thanks everyone!