The only way to have a gun that is * Exactly * as it left the factory , is to put it in the safe , and never shoot , carry,
or handle it.
Ruined ? No . It is still as functional as ever , just with a minor cosmetic boo boo . By no means picking on you, but what is goal here ?
Are you trying to recreate the factory finish ?
Have a uniform appearing , reasonably attractive gun ?
Many of us here would just go on shooting it like that , and not think twice about it .
Back in the day , during the Revolver Era , when Revolvers were just regular guns to be used , and not collectable Object 'd Art , it was common for owners to tweak their stainless guns finish to suit their tastes and preferences .
Having been exposed to Nickle plated guns in my formative years , I'd been known to judiciously apply the occasional mag wheel polish .
Brushed finish get so shiny spots from holster wear ? Several of the methods in this thread could make them far less noticeable with a couple minutes efforts . Or just leave them as a sign of character .