How did you get it off your co-worker??
If youve got seat covers a bathtub with warm water and gentle rubbing will work (I forgot who posted that).
If its the seat then you might want to borrow the nearest Siberian Husky and put him/her in your truck and show the dog the stain. They can get anything out of car upholstery if it is tasty enough. (I found that out by accident by the way....).
Actually - go to the nearest Pep Boys or something similar and check out the "detailing" section. They make sprays too numerous to name that take care of those kind of needs.
Personally I use seat covers and toss them every few years because Im lazy.
Cheers!:frog: