Nuka-Cola Clear formula

The Nuka-Cola Clear Formula  is a quest item in Fallout 3.

Background
The formula describes how to make Nuka-Cola Clear, a type of Nuka-Cola invented shortly before the Great War but never mass-produced.

Locations

 * The formula is located in the R&D section in the safe on the wall of the Nuka-Cola Plant. R&D is research and developement, and is located in the first area to the left, after entering the plant. You must get the key for the safe from Milo, Shipping Foreman.
 * After getting the formula, head to the Red Racer Factory, northwest of the Nuka-Cola Plant, where you will be met by Goalie Ledoux and the remaining members of his faction, Sudden-Death Overtime (you'll find the corpse of one of his teammates elsewhere in the Nuka-Cola Plant). He will offer you 250 caps for the formula or 400 caps if you pass the speech check. You may also choose to "face-off" resulting in killing him, his faction, and keeping the formula for yourself for collection value.

Related quests

 * The Nuka-Cola Challenge (optional objective "Just for the taste of it")

Behind the scenes
This is most likely a reference to Crystal Pepsi or Tab Clear which was released but was never popular. They were clear or "uncolored" versions of the soda that had the same taste but simply transparent. The drinks never caught on and were soon discontinued, though frequently mentioned or parodied in popular culture.