Hogwarts laundry

There is a Laundry at Hogwarts Castle. It is presumably run by house-elves.

In 1992, Hermione Granger snuck three Slytherin robes from the laundry, in order to Harry, Ron and her be dressed as Slytherin students when they had drunk the Polyjuice Potion.

Appearances

 * Harry Potter and the Chamber of Secrets (film)