I just got some used stirrup irons for my saddle. I got them for free, so if my problem can't be fixed, it's fine. Anyways, they are supposed to be silver, I think, but they are gold. Do they make gold stirrup irons? They have been in this shed by an arena for about a year and a half, so I don't know if the weather changed their color or what. Anywho, if they are supposed to be silver, how can I clean them?