Never underestimate the cleaning power of steel wool. You can get a lot done with 000 and WD-40 and then go to 0000 and WD-40 and then 0000 and polish and then just polish. It will not remove any healthy steel but when combine with a healthy quality of elbow grease it will get rid of just the rust and corrosion. I think that is a prime candidate for very little work and keeping the old girl looking her age but much much healthier, the scale just need to be cleaned and soaked in neatsfoot oil by the looks of things.