Spoiler: It's not all that magic. (From 2015)
the kitchen, crayon streaks on the freshly painted wall, scummy rings in the bathtub—these fouls are powerless against the cleaning strength of Mr. Clean Magic Erasers. Since hitting the market more than a decade ago, the erasers have rounded up a consumer base that swears by the magic. But the secret behind the material that makes up the scrubbers, melamine foam—the same stuff that’s widely used as an acoustic insulator in recording studios—is less magic and more simple chemistry.
By itself, formaldehyde can be dangerous and sometimes lethal—irritating the skin, corroding internal tissue, and even causing cancer. But if you mix it with melamine, the result is a tough resin in which those toxic effects are neutralized. High tensile strength makes the resin a suitable material for dinnerware and countertops. Force gas bubbles to form in the resin during the manufacturing process and you end up with Mr. Clean’s melamine foam.
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