Re: Rust removal from dies.
Exterior WD40 and a wire brush.
Enterior Chuck an old rod or dowel in a drill. Wrap a few layers of paper towel on the other end. Overlap a piece of 600 grit sandpaper about 2"x2". Oil it and polish the enterior of the die. Follow with 1000 grit, then the rod wrapped with polishing compound doused cloth. Oil it too. Your sizing die will run smoother.