A first application of a cleaning material is made to a surface of a substrate. In at least one embodiment, the rotary shaver may be a curved rotary shaver. 5 mm or less, and a length L is in a range of 1. The retainer band is installed in the slider, with stepping aside in the relief flute for linear movement relative to the track rail as the slider travels along the track rail. The switch membrane may include a plurality of switches disposed on the first sheet of film, each switch configured to complete a respective circuit with the conductive traces when the switch is depressed.