I remember Zud. After you used it to clean stuff, the skin would fall off your hands.... OK, I'm exaggerating but only a little. That stuff was powerful.
Those of us in the know can buy Zud and Bar Keepers Friend and get great results without needing ads to reminded us to buy the stuff. I use BKF on AllClad pots and pans and glassware to remove spots and get a cleaner kind of shine. Great on Chrome too.