‘Chewing a willow twig and washing the face is the true dharma of ancient buddhas. It should be practiced and realized by those who practice the way with way-seeking heart. If warm water is not available, use cold water, which also is an old way, ancient dharma. When warm or cold water is not available in the early morning, wipe your face thoroughly, spread fragrant herbs or incense powder, then bow to the Buddha, burn incense, chant sutras, and do zazen. Without washing the face, all the practices would lack authenticity.’ (Shobogenzo Semmen)
Dogen telling it like it is, again. One of the passages we have looked at in the Dogen study group, which you are welcome to join.