My friends pcs are the worst. He basically well now, his grandma lives with him, because she's getting very old, but it started out that he lived there. He has a couple friends that hang around there too. All of them smokers, the grandma included. They have super powerful air cooled cases, these are loud powerful fans, so when I asked if I could have his old 6800gt to see if I could revive it via the oven, I thought at first it got so hot it scorched the plastic fan cover..
no that was tar that built up on this card for nearly 3 years. it was disgusting, and extremely hard to remove.