In article , Stephen Howard
writes


Assuming the nozzle is in the cartridge, simply remove it from the
printer and dip the relevant end into a cup of near boiling water for
ten seconds or so.

It isn't in Epson's' which is why their ink is cheaper than HP. However
when you buy a new HP ink you get a new nozzle etc. which does help. i
have thrown away several Epson's as there was no way to unblock them and
no repair shop would look at them once they were a few years old, yet
they were generally sturdier built and didn't blow your eyeballs off
with their colours as sometimes happens in HPs.
--
Janet Tweedy
Dalmatian Telegraph
http://www.lancedal.demon.co.uk