How do I bathroom / kitchen / extension? etc.

I’ve done it many times to low value things - lacquered sash window pulls and latches etc. It depends on how they’re lacquered, and you can’t tell until you try. I have left in acetone, boiled in vinegar, cooked in oven to age, etc. and had good results, but I wasn’t looking for a particular finish, just to age them. I guess if you get markings you don’t like you can polish it again and let it tarnish naturally.