Box of detergent (Fallout 3)

 is an item in Fallout 3, useful only as Rock-It Launcher ammunition. It is found all over the Wasteland and will be in your Megaton house (possibly your Tenpenny Suite, unconfirmed) when you buy an Explorer or Vault Theme. There are around 40 Boxes of Detergent in Gold Ribbon Grocers, which are used to make a rube goldberg machine.