how to clear blocked emitters in techline irrigation?

I've got a bunch of salvage techline dripline from netafim. Some of the emitters are blocked, probably by debris or scale. How can I go about clearing them? These emitters are pressure compensating.

Bump.

I know nothing of emitters, so take this for what it is worth.  Since no one else has responded.  I will weigh in.  

If it is scale, try hot vinegar solution.  Works in coffee pots and shower heads.  It should work for an emitter as well.  If it is debris, back flush with water or compressed air.

I use this type of dripline extensively. The emitters occasionally become blocked from very fine sediment in the water. I have found that most blocked emitters can be cleared by lightly hammering the spiral capillary when the line is under pressure. It seems best to use a mallet and place a bit of steel pipe under the dripline. Rotate the dripline as you hammer it. I have also used vice grips to squeeze the spiral capillary but hammering seems to be more effective but is more brutal. This type of dripline is pretty good in my opinion. Blockages are rare and would be less frequent if I was more conscientious about flushing the lines by opening the valves at the end of the run.