Magic Erasers are, well, magic. They help you tackle the toughest cleaning tasks with less scrubbing than most other tools. According to T.J. Liles, vice president of Maid Brigade in Atlanta, Georgia, this is because “Magic Erasers are made from melamine foam, which is highly abrasive and porous, and a built-in cleaning agent.” If it’s so effective, what’s the problem, right? “The abrasiveness can be too harsh for more sensitive surfaces,” he explains. Basically, they can work too well and scrub off entire finishes before you know it. That’s why, if you have any doubt, Liles recommends testing on a...