Has anybody ever used CLR (calcium/lime/rust) remover for removing dull finishes? I have an old twist type garden hose nozzle that was pretty ugly. Not rusted, nor covered in lime or calcium residue. Just brown and ugly. My wife wanted me to clean the shower head since we have hard water, and she thought the head was clogged with calcium build up. So, I got three bottles of CLR and dumped two of them into an empty plastic coffee container and put the shower head and this garden hose nozzle in it and left them soak for about three hours. The shower head turned out nice and clean, and works a whole lot better than it did. At least the streams come straight out at you, instead of two or three shooting to the left, and a couple more shooting to the right or up. Anyway, to my amazement, this garden hose nozzle came out clean. The brown tarnish was removed, and the material seems to be made of copper. I thought I'd go over it with a stainless steel wire brush, and WOW, what a difference.
I'm at work right now, but when I get home this afternoon, I'll post a picture or two of the final results. Never gave it a thought before, to try using this stuff as a metal cleaner.