My sink was stained up and had irremovable hard water/corrosion stains. I went to home depot and found a $10 sink polishing kit. It has various grades of sandpaper. Amazingly it took everything off and restored it to like-new condition. Hardly took any elbow grease, just
15 minutes.Anyone know what grit sandpaper they use ? I want to buy some more to clean up some of my bathroom fixtures. Or should I just buy another $10 kit?