Brand from Japan: Rohto Mentholatum. A powerful enzyme cleaning and storage solution specifically for oxygen-permeable hard lenses (O2 lenses) and hard contact lenses.Simply soak your lenses in this bottle overnight for thorough cleaning.The secret to powerful cleaning is that the proteolytic enzymes and lipid-dissolving ingredients, which are the key to the cleaning power, are mixed together for the first time when the bottle is opened.Generally, if proteolytic enzymes are left in the water for a long period of time, the cleaning power will decrease.Therefore, in order to avoid this, an original bottle exclusively for O2 one was adopted.The enzymes start working after you open the bottle, so the fresh, powerful cleaning power of the enzymes will last for about a month until you finish using the bottle.Can remove protein dirts, cosmetic dirts and preserve.Contains antibacterial ingredients.Can also be used for scrubbing.Before wearing the lenses, rinse them thoroughly with tap water.Easy to open with o