Check out this link I posted a couple years back. All it came out to, was some gunk that needed cleaned out.
The parameters work the same on the pope. Remember, no vac. And make sure your cold trap is cold before starting. I used xylene, but now I just go to home depot and grab a gallon of zep orange concentrate. The terps from the zep is why you should at least run 1L of ISO 200 proof to make sure its all out.