Squeezing of the hair is not forbidden from the Torah because the hair is hard and does not absorb the water but squeezing the hair is forbidden according to the rabbis. Whoever immerses in water on Shabbat, whether a man or a woman, they cannot wring their hair but should bring a large and special towel to wipe and rub their face and their head with it. Even though the rubbing results in the squeezing of the hair this is indirect [as with the back of your hand] squeezing. Because the squeezing of the hair is rabbinical [and not forbidden from the Torah], the sages allowed to do it in this way, because it is not possible [otherwise], and because it is indirect, and the water that is squeezed out is waste water. And nevertheless one should not rub with force, but caress it slowly, until the water that is in the hair is absorbed by the towel. And there are the pious who don’t rub their beard hair… When one drinks water or other beverages, it’s correct to be meticulous in not squeezing the mustache hair. But you can rub it with a towel.