This quality natural sponge is from the Mediterranean and was harvested by hand. Rinse with clean water after each use, gently squeeze dry, and hang up to air dry. Please don’t ever wring it out.Heavily soiled natural sponges can also be washed in the machine up to a maximum of 30 degrees Celsius or disinfected with 70% medicinal alcohol (Isopropanol) – of course, natural sponges are not machine-washable in hot water.