I probably wouldn't do the whole oxalic treatment myself. Instead, I'd knock off (wire wheel/brush, fine sand paper, etc.) any active or dust bubbling, then do a few coats of boiled linseed oil to provide some protection. For the chrome parts, I usually ball up some aluminum foil, add some oil, & buff out the rust.
Here's my Twenty that I've done almost nothing to (I got lucky, but I also don't mind a little"patina"):
