A bath was a method of cleansing.
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)
Reef Holloway suffered from pedal immersion addiction, meaning he had to have an herbal foot bath every four or five hours. (COMIC: Interstellar Overdrive)
Sasha tried to kill Billy by boiling him in the bath, but Gwen Cooper saved him. (PROSE: First Born)
It was rumoured that Elizabeth Bathory slaughtered over six hundred people and bathed in their blood. (PROSE: Managra)
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)