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Boil white vinegar in the unit. If the tube isn't completely blocked, the acid steam will clear it. If (after boiling the vinegar) it doesn't open up, then use wire pipe cleaners soaked in hot vinegar to slowly "****" it out, dissolving the calcification as you go. Pre-soaking the tube in hot vinegar will help. If you can remove the tube and lay it down in a kitchen pan, then boil it in vinegar. Once cleared, make sure to boil vinegar in the unit and eject the steam through the tube on a regular basis, at least once every 2-3 months, to keep the scale deposits down.