Hi Gerri, It sounds like the metal magic does turn the metals into crystals - I would put a little more ascorbic acid in, so it will lift the stains off, then combine with the metal magic to get rid of it. Metal magic sells an ascorbic acid based product to use along with the metal magic too, so that's why the stubborn stains didn't come off with just the metal magic. Hopefully this will be the cure!! Please let us know how it goes.

Roddapool, Gerri is right about the low chlorine and ph to get the united chemical stain treat to work better, but it is ok to use with chlorine, it will just use up the chlorine in the process. It will take the chlorine and ph down on it's own. It will tell you on the container that you can use it with chlorine and ph. It just doesn't tell you that you will need more product to do the work. So it is up to you. Let us know if it doesn't take all of the stain off - because there are other ways to get it off.