Take the bag. When you hear Cletus' steps, hide in a recess next to the bathroom. Take a carpet cleaner and mothballs. Examine the pipe over Rufus' head and the mirror. Unscrew (with a screwdriver) the screw and check the toothpaste. Read (by pressing RMB in your inventory) the carpet cleaner's label and add it to the Cletus' toothpaste. Throw mothballs into the pipe.
When Cletus starts brushing teeth, move the mirror. A mini-game will start - move the toothbrush (up and down), following Cletus' example (pay attention to the arrows on the right and the indicator). Make sure that the indicator stays at the maximum level and does not drop to a minimum - Cletus will not guess that something is wrong. After that, Oppenbot will appear. Give him one of the bags. Rufus will find out that he gave Cletus' bag instead of Bozo's. Go down to the reception desk. You will get the right bag. Go to Doc's room.
Rufus leaves the room. Goal will follow him. In the corridor, they will come across Argus, Donna and Cletus. A mini-game will begin, in which you have to make Donna and Cletus meet in the corridor. Climb down the stairs to bring a character back to the corridor. Enter the Seer's room, and you will leave the ghost's room (and vice versa). When Donna and Rufus appear in the corridor at the same time, they will lock themselves in the locker. If Goal meets either Organon or Cletus in the corridor, each of them will follow the girl. Click on the door of the Seer's room - Organon will come out of it. Click the door again, this time Goal will appear. Go down the stairs to the room with the pie vending machine.