You can use this powdered cleanser on any non-porous surface, for example: stainless steel, glass, ceramic, porcelain, and acrylic. Just add some of the powder while scrubbing/wiping the item or surface with water and it'll make a drastic difference. According to reviewers, even the toughest stains will be gone within minutes!
Promising review: "This stuff works so well, you'll feel like you're in a staged infomercial where your surfaces are left gleaming and impossibly new. I removed the worst stains from my white ceramic sink, which I had tried everything on — bleach, oxygen cleaners, lemon, and baking soda. Nothing worked. But sprinkle some Bar Keeper's Friend on there with about 10 minutes of elbow grease and BOOM, it looks almost brand new. I'm obsessed. I could not recommend it more." —KathleenH
Get it from Amazon for $7.29 (also available in packs two, three, and six).