If you’re a cleaning enthusiast, you probably own a magic eraser. These melamine sponges are basically sandpaper in disguise. They remove stains by micro-abrading the paint, so use a light hand.
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Dampen the eraser, squeeze out excess water, and rub the stain in small circles. It’s like giving your wall a delicate exfoliating facial. Overdo it, and you’ll rub off the paint, revealing a patch of primer that looks like a bald spot.
For painted walls (especially rental apartments), this is a last resort. Better to try alcohol or soap first—ask the eraser to wait in the penalty box.