Efillink CIS and Refillable Cartridges

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HP B9180 Refillable Cartridges

HP B9180 Refillable Cartridges 

Keeping the print head area clean will prevent trouble with the NEDD sensor.
Keep the head cleaning station clean with a damp paper towel.   Isopropyl alcohol or Windex can be used on the paper towel to clean the dry ink.  A few drops of Windex on the sponge will help get rid of the dry ink on the sponge which might stop the flow of ink during a head clean.
This is bad:
HP B9180 head cleaning 1
This is good:
HP B9180 head cleaning 2