They are foam sponges with water-activated micro-scrubbers. When wet and squeezed, the micro-scrubbers lift dirt from surface grooves so the sponge cleans effectively using just water.
They are marketed as multi-surface cleaners for common household areas such as walls, doors, light switches, cabinets, countertops and shoes. Product details note certain materials (see not-recommended list) where use is discouraged.
They remove common household marks such as fingerprints, marker and ink, crayon, scuffs, soap scum and greasy kitchen grime, among other common stains.
Wet the eraser, squeeze to activate the micro-scrubbers, then rub the mess. Rinse the eraser after use — it can be rinsed and reused for additional cleaning.
Yes. Listings state the erasers can be rinsed and reused multiple times; some longer-lasting versions are described as suitable for daily rinsing and reuse for tougher cleaning.