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A sponge is a tool or cleaning aid made of soft, porous material. Typically used for cleaning impervious surfaces, sponges are especially good at absorbing water and water-based solutions. Synthetic sponges can be made of polyester, polyurethane, or vegetal cellulose. Polyurethane is used in polyester sponges for their abrasive side. Polyester sponges are more common for dish washing and are usually soft and yellow. Vegetal cellulose sponges made of wood fiber are more used for bathing and skin cleaning, and are usually tougher and more expensive than polyester sponges. They are considered more eco-friendly than polyester sponges as they are biodegradable and made of natural materials.