The mop is seen throughout the whole episode, but it is notably used at the end when SpongeBob is cleaning. Everyone loves when SpongeBob does this, though when Squidward uses the mop, nobody cheers. The act is deemed so great that Mr. Krabs orders three more shows to happen.
Fred is seen working as a janitor and using a mop to clean the floor of Shady Shoals. When Mrs. Puff and SpongeBob cause Shady Shoals to fill with cranberry juice, Fred does not look up from his mop and continues to clean the same spot.
Plankton slips on the floor of the Krusty Krab after SpongeBob mops it. He sues the restaurant for failing to mark the mopped spot with a "wet floor" sign. At the trial, SpongeBob interrogates the mop itself, scolding it for having made the floor slippery.
When Mr. Krabs finds out that SpongeBob summoned ghosts to the Krusty Krab, he uses the mop to push them back into the orb they came from. He says "Time for the bossman to mop up!" and swings the mop like a baseball bat.