Gintama Episode 113: The Act of Polishing a Urinal Is Like the Act of Polishing One`s Heart / Subtitle Undecided
Episode 113 of 201 of Gintama, aired July 2, 2008, 25 minutes. Available with English subtitles and dub where released.
Episode summary
A member of the Shinsengumi suggests a "washroom revolution". Eventually it evolves into a battle of Shinsengumi vs. washroom germs.