I have a Kohler double porcelin white sink. Over the years, as careful as we can be, it still has acquired those little gray marks from pans. Is there a product to remove them? I tried the stuff we use on the cook top but it doesn't work.
Those Mr. Clean scrub pads will take the print off of wallpaper. They are slightly abrasive to work like they do. They might work.
I use Bar Keepers Friend on such things.