Eau de Mixilpixil

Eau de Mixilpixil was a reward from The Touch of Zanzil (3), which has been removed from the game. It was used to remove the debuff Touch of Zanzil. Although some rogues can still obtain it, it no longer serves any purpose.

Source
Rogues who have completed the quest can still obtain Eau de Mixilpixil from Doc Mixilpixil by speaking to him.