Diluent

Diluent is an item found in Silent Hill: Downpour. It can be found in two different locations depending on the level of difficulty the game is currently being played on. It is used to set a pile of trash on fire to trigger the Otherworld shift in the Centennial Building.

Location
There are two different locations it can be, dependent on difficulty:
 * On Easy and Normal modes, the diluent can be found on the Centennial Building's eighteenth floor in the storage room of 1703.
 * If the game is on Hard mode, the diluent can be found in the kitchen area.

Trivia

 * In chemistry, a diluent is an agent used to loosen viscous fluids. They are most well-known as simply thinners, such as for paint.