What did janitors do in medieval times?

Answer 1

The position of janitor seems to be of modern origin, as there are no records of them until after the Middle Ages ended.

During the Middle Ages, there were a variety of people who did cleaning and upkeep in different places. For example, a manor would have been cleaned by maids, and upkeep would have been provided by carpenters and masons, who may have had other jobs when these skills were not needed. Similarly, cleaning and upkeep in a church or monastery would have been supervised by a person called the sacristan, with most work done by a person called a custos, though specialized work would have fallen, again, on the carpenter and the mason.