Washing Machine is a game mechanic located in the Laundry in Night 4. It appears to be a normal looking Washing Machine, with it's door open, the color being white. The washing machine appears to look like a 90s Washing Machine.
It is usable by clicking the Washing Machine. The green button on it indicates that its activated; you'll know by the sound it makes.
Will keep Mario away from entering the Laundry if he's in the Staircase.
Also works in the Bedroom and Living Room 2, and when Mario is not on the map.
While it is on, the player will be unable to hear Waluigi and Luigi's breathing, which means that the player must check the cameras to figure out where they are.
Failure to keep the Washing Machine on will Result in Mario killing the player.