Some of it is odorant and some more of it is lubricant used for piping valves.
when your pot accumulates it to the point where is gains 5 pounds it is not easy to flush. I do not have the OPD blues but go way way (I mean, far) out into the desert and add a few quarts of solvent let it slosh back and forth, dig a hole and pour the liquid into the hole. Light it off then let it burn down. Pure sand no fire danger, then I refill the hole. Careful! One single drop of liquid on skin or clothes and you will radiate HAZMAT LEAK(!) for days.