I moved into an appartment, and the bathtub is stained. It's an old tub, and the shine is long since gone, but I'd like to get it as clean as I can. Since the enamel finish on it is pretty much gone, I can't seem to get the grayish stains off the floor of the tub... it has a persistent ring around it too. I've tried bleach and I've tried Ajax (combined with vigorous scrubbing), but nothing seems to make these old dirt stains go away. There's no rust at all, just dirt stains...
Does anyone have any good ideas that I can try to save my old enamel-void tub?