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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.

The first references of sponges used for hygiene dates from the Ancient Greece. Competitors of the Olympic Games bathed themselves with sea sponges soaked in olive oil or perfume before competing. In the book Odyssey by the Greek poet Homer, the god Hephaestus cleans his hands, face, and chest with a sea sponge, and the servants in the Odysseus palace also used sea sponges to clean the tables after the meals the suitors of Penelope had there. The Greek philosophers Aristotle and Plato also mentioned sea sponges in both scientific and historic contexts in their works. Ancient Greeks also used sea sponges tied to sticks as toilet paper, and washed them with sea water.

Ancient Romans also used sea sponges extensively for hygiene and other uses. The belief that sponges had therapeutic properties led to its usage in medicine for cleaning wounds and treating disease.

Sea sponges were used as tampons by females throughout history and are still used as a cheaper and more eco-friendly alternative to fibre ones. However, researchers do not recommend using sea sponges as tampons, as they may contain dirt and microorganisms, especially if poorly sanitized.

In the New Testament, a Roman soldier offers Jesus Christ a sponge soaked in vinegar on the tip of his spear (some versions say staff) for Jesus to drink during his crucifixion, as an act of mockery.

Synthetic sponges where made possible to be manufactured only after the invention of polyester in 1941 and the commercial production of polyurethane foam in 1952.

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

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