Bath

A bath was a method of cleansing.

After Chris was found by his family, his Mam gave him a bath to warm him up. (PROSE: Fanboys)

It was rumoured that Elizabeth Bathory slaughtered over six hundred people and bathed in their blood. (PROSE: Managra)

One TARDIS bathroom had a large bath with many alien plants hanging around it. The Fourth Doctor told Bryony Mailer he always did his best thinking in the bath. (PROSE: The Drosten's Curse)

Sasha tried to kill Billy by boiling him in the bath, but Gwen Cooper saved him. (PROSE: First Born)

During the global afforestation of the Earth in the early 21st century, a minister broadcast a message telling people to fill their baths, sinks and buckets with fresh water. (TV: In the Forest of the Night)

Reef Holloway suffered from pedal immersion addiction, meaning he had to have an herbal foot bath every four or five hours. (COMIC: Interstellar Overdrive)

On an celebrity episode of Bear With Me, a bear got into the bath. This was enjoyed by both the Ninth Doctor and Lynda Moss. (TV: Bad Wolf)

Among the implanted memories of Edwin Bracewell was remembering a time where breakthrough regarding hypersonic flight came to him in the bath. (TV: Victory of the Daleks)

When investigating Ravenscaur School, the Twelfth Doctor materialised in Clara Oswald's room when she was in the bath. When she protested this, he waved it off, claiming that proper hygiene was important for a time traveler, lest they introduce a bacterium to a time period it was not native to. (COMIC: Clara Oswald and the School of Death)

Behind the scenes

 * One of the questions in the titular Test in the quiz game UNIT Initiation Test from Doctor Who Annual 2006 (not considered a valid source on this Wiki) was how long it would take two Autons to fill a bathtub using one tap if it took one Auton ten minutes to fill the same tub using both taps.