Boston One Step Liquid Enzymatic Cleaner is a simple and convenient way to effectively remove protein deposits from gas permeable (GP) contact lenses to help maintain contact lens wearing comfort. Convenient liquid works right in your lens case as you disinfect your lenses so it?s easy to use and saves time. Most practitioner recommend using an enzymatic cleaner at least once a week. Free lens case enclosed is easy to use and compact for travel. Clear, odorless formula.