Sometimes, due to excessive contamination or the requirements of a Preventive Maintenance program, you just have to tear down a piece of equipment. Split a die, pull a screw, open up heads…all unpleasant tasks. Often a purging compound, used as a pre-tear-down aid, can make the job easier.
Some resins are tacky and difficult to remove from metal surfaces but purging compounds are designed for removal from the system – they should peel off quite readily. Just run the purge in accordance with the supplier's instructions and when you reach the stage where the system is run empty, cut the heats and begin your tear-down.