I've done most of my firearms.
Better quality nail polish does look better.
Gold glitter gets on EVERYTHING
Acetone based nail polish remover (or just acetone), very light touch with kimwipes or gun cleaning pads. Take your time, try not to rush, don't press too hard.
Wipe down the area with acetone before doing the nail polish. It will pull the oil off the surface as it's cleaning, so after the polish dries, make sure to re-oil the area.