Cleaning an Extruder

Molten plastic out of an extruder? Blow torch works, but is will destroy your metal screw or barrel.

Proper cleaning - mild temperature, copper gauze, brushes, and stearic acid as lubricant.

http://www.plastemart.com/plastic-technical-articles/correct-method-and-material-to-clean-extruders-without-damage/1388