3 Magic Eraser Stain Remover Cleaning Blocks 5 "Absolutely Magic! Wouldn't be without them." Mrs Ludlow 13 June 2019 I'm still amazed how these things work. Sparkling results with no effort. The only thing that worries me is when tea stains are left in cups, what are they doing to your insides - especially if you don't take milk. Stains on my non-milk tea cups always worse than those of my other half who does have milk.