All of my clocks but one has the original finish on the metalwork except that I put a clear finish on them to protect the remaining finish from disappearing. The one that doesn't have the original plating, has copper leafing applied, which if I had a way to plate them I'd do that instead. I know the die hards think that you should leave the dirt on them and not clean them at all. Unfortunately for those that think that, mold, mildew, dust, and grime do not fly in our house and they get cleaned inside and out. The health and happiness of my wife and 6 children come first to the nasty ravages of time.
Personally the way I look at it is this...if the owners of these clocks actually took care of them properly, they would still look like the finished polished clock anyhow minus the clear finish on the metal. I know these are clocks and they aren't old cars, but I like to compare them anyhow. If you bought an old Model T that was completely original but looked horrible due to years of neglect, and all it took was some elbow grease and time to polish it up without repainting it or changing the originality of it at all, would you leave it covered in filth in order to please others, or would you polish it up and enjoy it as the beautiful original antique it is?
Or how about an old Victorian home...would you buy it in disrepair and keep it that way or would you bring it back to it's original beauty?
Sorry for the rant but I figured I'd give my 2 cents on this subject. I understand everyone has their own opinions too and appreciate everyones comments.
Oh, one last question! Are those who are true to keeping the clocks dirty and original in favor of keeping the movements dirty and non-working as well? It would only make sense in my opinion.