Cleaning the metal face of a Jeff Rowland Model 3

For reference, here is the unit:
https://www.hifi-advice.com/blog/jeff-rowland-company-special__trashed/jeff-rowland-power-amplifiers...
Anyone know how to clean one of these metal faces? Mine has a couple of splotches.
Also, anyone know if you can replace the faceplate of a Rowland with the newer polished look?

idfnl03-10-2019 6:52pm

nonoise Details Discussions Posts This discussion Message User 10,544 posts 03-11-2019 at 08:37pm Copy Comment URL Report Comment Edit Delete GooGone. https://www.amazon.com/Goo-Gone-Original-Adhesive-Stickers/dp/B009M14C4S/ref=asc_df_B009M14C4S/?tag=hyprod-20&linkCode=df0&hvadid=242071853242&hvpos=1o2&hvnetw=g&hvrand=6303186198244753844&hvpone=&hvptwo=&hvqmt=&hvdev=c&hvdvcmdl=&hvlocint=&hvlocphy=9031183&hvtargid=pla-406530958981&th=1 Sorry about the length of it. All the best, Nonoise