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MB3 89b: Drying Dishes and Using Mirrors on Shabbos (302:11-13)
Drying hands on a hard surface. Wiping your dirty hands on a towel usually used to dry your hands. Drying dishes with a towel on Shabbos (vis-a-vis squeezing). Using a mirror on Shabbos that has a sharp edge that is made to remove hairs.