Bar Keepers Friend is awesome. I've been meaning to try it for a while, so when I found a Bar Keepers Friend coupon, I decided to finally give it a try. I first used it on my nasty porcelain kitchen sink. It not only cleaned the sink up, turning it white again, it removed stains I had previously tried to remove using Magic Eraser! It also cleaned off grey marks from when I scrub my baking sheets in the sink.
I also used Bar Keepers Friend to remove silverware marks from my white dishes. It was incredibly easy - the marks just rubbed right off. And my dishes look so much better now.