This large natural sponge is from the Mediterranean and was "harvested" by hand! So beautiful! 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 in warm water ONLY or disinfected with 70% medicinal alcohol (Isopropanol) – of course, natural sponges are not machine-washable in hot water.