The sponge should be rinsed thoroughly with warm water after each use, making sure to rinse out as much of the soap used as possible and then either hung up to dry or placed on a strainer type dish to dry. The sponge should never be left on a wet flat surface as bacteria can collect on the part of the sponge that is left wet. If need be you can rinse your sponge in two parts water one part hydrogen peroxide for a fresher cleaner smell. NEVER USE CHLORINE BLEACH ON YOUR SPONGE! The bleach disintegrates the sponge fibers and either weakens it or renders it totally useless.