Like you I too work in a oil refinery some of you may not know that toluene is absorbed into metals and once its there its there the only way to remove it from the metal is by heating the metal then the toluene releases from the metal but as a vapor, which is worse then when its is a liquid im not saying the liquid toluene is good, it BAD sh*t, its just even worse in vapor form as previously stated it is a solvent and with harm the rubber in the fuel system eg hoses o-rings in injectors etc just my 2cents