With proper care, your Implicit Creations plug should last a lifetime. Its medical-grade silicone is non-porous and sterilizable.
Simply wash the plug with soap and hot water. Dish soap works well. Store in a ventilated space.
Put the plug in a pot of boiling water. Keep boiling for ten minutes, then remove it from the water with tongs. Let it cool for at least ten minutes before touching and at least thirty minutes, or until completely cool, before using.
Do not use silicone-based lubricant on silicone, such as your Implicit Creations plug. While some silicone lubricants may be compatible, many will permanently bind to the surface. All other lubricants, water- and oil-based, are compatible with silicone.