◇If the sponge gets dirty, the surface of the foundation will harden and it will be difficult to apply to the skin, so please keep it clean at all times. ◇If the sponge gets dirty, please use the separately sold "Shiseido Sponge Cleaner N" or dilute a mild detergent in lukewarm water and gently press it to wash it. After rinsing thoroughly so that no detergent remains, drain the water and dry well in the shade before using. ◇If it no longer opens and closes smoothly, please purchase a new case.