Teenage Mutant Ninja Turtles

Teenage Mutant Ninja Turtles is a fiction franchise that originated in comic books, and received adaptations in live movies, cartoon series, and video games.

It also received 2 anime adaptations, one of which where the turtles help a good fairy battle an evil fairy, and another where they must transform into samurai.

Besides the series, the name also refers to the Turtles themselves:
 * 1) Donatello
 * 2) Leonardo
 * 3) Michelangelo
 * 4) Raphael
 * 5) Venus

The turtles have been depicted in bathing-related scenes:

Archie
The Archie Comics production of TMNT is called "TMNT Adventures".

#23
Source:

Issue 3

 * Published September, 1996

Issue 11

 * Published May 2005

Source: Cleansing themselves in a ritualistic shower, three Foot Soldiers (a young woman named Izumi, a young man and a fat man) consider the power they are about to be given and the mission they are to undertake, though they fear the cost of failure.

Newspaper
Source: From either October 6th or June 10, 1991?

Teenage Mutant Ninja Turtles
When Raphael was injured battling the Foot Clan, the others leave him soaking in a tub as he recovers.