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A sponge is a soft, porous material or cleaning agent. Typically used for cleaning impervious surfaces, sponges are particularly good at absorbing water and aqueous solutions.

Originally made from natural sea sponges, today, they are most often made from synthetic materials.

Synthetic sponges can be made from polyester, polyurethane, or vegetal cellulose. Polyurethane is used in polyester sponges because of its abrasive side. For washing dishes, polyester sponges are most often used; they are usually soft and yellow.

Vegetal cellulose sponges made of wood fiber are more commonly used for bathing and cleansing skin and is generally healthier and more expensive than polyester sponges. They are considered more environmentally friendly than polyester sponges because they are biodegradable and made from natural materials.

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