You may well ask, What is it? I had no idea where to shop for Wizards Metal Renew Polish, so I took the easy route and ordered it from Amazon. It turns out to be part of a product line focused on car car. It's also available through chains like NAPA. It removes discoloration from a variety of metals, including steel, pewter, and brass (be warned, though: if the brass is lacquered, it will also remove the lacquer). You can apply it with a cloth and then wipe it off and polish the metal with a clean cloth. Unlike some other polishes, it has an agreeable smell.
I tried it first on the blade of a heavily oxidized back saw, a Jackson, a secondary line for Disston. As I wanted to save the saw's etch if possible, I applied it generously and gently used a sanding block with 320 grit wet-or-dry paper. You can tell immediately that it's working because the cream-colored liquid starts turning brown. I wiped the blade off and repeated the process. The etch was long gone, it appeared, but the blade once more looked like steel. What I like about the result is that it retains the look of use and age. The steel doesn't look overly polished, just well-cared for.
With "well-cared for" in mind, I looked around for what else might illustrate how Wizards Metal Renew Polish works if I took some "Before" and "After" shots. And I realized that the table of my Delta band saw provided a relevant example. I bought this band saw in non-working condition at least twenty-five years ago. I got it working and cleaned it up then, but I haven't touched the band saw's table since. So here's the Before shot:
And here is the outcome after two applications of Wizards Metal Renew Polish followed by buffing the table with a cloth:
The table now is clean enough to reflect some of the colors of the polish's container. I personally don't want it any shinier, but if you do you might go on to use Wizards Metal Polish.
The label of Wizards Metal Renew Polish says nothing about corrosion protection. To protect the newly cleaned steel, I wiped it down with Break Free CLP, waited a few minutes, and then wiped it dry.