Some rabbis of the Middle Ages argued that after eating solid dairy products such as cheese, the hands should be washed. Shabbatai ben Meir even argues that this is necessary if utensils such as forks were used and the cheese never touched by hands.[103] Other rabbis of that time, like Joseph Caro, thought that if it was possible to visually verify that hands were clean, then they need not be washed;[104] Tzvi Hirsch Spira argued that washing the hands should also be practiced for milk.[105]