Clean with soapy water and wipe with a soft cloth.
« Around 12,000 steps (11,674 to be precise): The largest stairway in the world is in Switzerland and run up once a year during the traditional Niesen race. »
Like this model?
But these additional references also bring something new to the table:
Some of them feature new combinations (interior/exterior wood veneer on a carbon blade), and in addition to natural shades some are available in tinted wood (blue, red, duck blue, khaki, etc.)
Hollowed-out detailing adds further refinement to the front and creates a sense of continuity with the hinge.