Cream of Tartar apparently works wonders on many things, including porcelain. It is quite the bleaching agent I guess. So, you could rub some into the stain and scrub a bit - and apparently the stain disappears.
__________________ ~ A friend told me I was delusional. I nearly fell off my unicorn. ~ °¨¨¨°ºOº°¨¨¨° Ann | Pfeiffer | Marcel Verdel Purcell | Wylie | Artie °¨¨¨°ºOº°¨¨¨° |