A wiper blade includes a first blade and a second blade surrounding the first blade, such that the first blade is not exposed for use, wherein the removal of the second blade exposes the first blade for use. The sensor is coupled to an actuator that regulates the flow of steam via a valve located between a steam chamber and steam outlets. Using keyed detachable knobs, different keys can be configured to provide different ranges of rotation of the rotary switch, thereby enabling different switching authorizations, based on the particular knob that is used.