Every days cleaning can remove most of the deposits and "foreign bodies" attached to the surface of the lens. Among them are proteins derived by the tears, these deposits can't be removed totally with daily cleaning methods and as result they are accumulated on the surface of the lenses, and in time create problems to the eye, like irritations and blurred vision.
Therefore, regardless the system used, it is necessary to perform on weekly basis the protein removal cleaning circle suggested by your eyecare practitioner. In almost every case protein removal is made with enzimatic tablets, placed in the case, with the storage liquid.

The tablets mentioned above are different according to the method used , that is , the peroxide method and the surface-acting method.