Koba Corporation The Power of Rubber, for Pore Problems! Gomupon (Rubber-Pon) Smooth Nose Can also be used on areas other than the nose, such as the chin, forehead, and facial lines. How to Use: Soak well and soften. Smoothness achieved with just water. Soap can be used if desired. Simply wipe gently for a smooth feel. After Use: Wash well, squeeze, and dry. Stock purchased in December.