@WenC, To retain the gold wash/plating, do not use abrasives like sandpaper or steel wool. It is, however, safe to use WD-40 on a cotton cloth for the gold wash. If you decide to sand the other parts of the blade, cover the gold wash with tape.
I would also read the last few months of What's on your work bench right now? - https://www.badgerandblade.com/forum/threads/whats-on-your-work-bench-right-now.503881/ - contains tons of valuable information.
I would also read the last few months of What's on your work bench right now? - https://www.badgerandblade.com/forum/threads/whats-on-your-work-bench-right-now.503881/ - contains tons of valuable information.