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 is also a large amout of Boxes of Detergent (Around 40) in Gold Ribbon Grocers.