BT Fax User Manual page 57

If the print quality does not improve after purging
the nozzles, the contacts may be dirty or there may
be dried ink on the nozzles.
Remove the print cartridge from the
machine, see "To replace an empty ink
cartridge" on page 51.
Dampen a clean cloth with water.
To dissolve any dried ink, hold a damp
cloth against the nozzles for about 3
seconds and wipe gently. To avoid mixing
colours, wipe from one side to the other,
in one direction as shown.
Allow the nozzles to dry.
Using a clean damp area of the cloth, gently
wipe the entire gold covered area, on the
back of the cartridge, from one side to the
other, as shown.
Gently wipe dry.
Ensure cartridge is dry before replacing in
the machine.
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