Brother GTX pro Instruction Manual page 179

(4) Wipe the resin part between the print head's nozzle surface and nozzle guard.
<IMPORTANT>

Be sure not to touch the red-frame zone of the nozzle surface.

For cleaning, be sure not to use any tool other than clean stick R.
Clean this part
Nozzle guard
Cleaning conditions
Cleaning location
Between the nozzle surface and nozzle guard
<IMPORTANT>

Be sure to use the clean stick R separately for white ink and color ink.
<TIPS>

There may remain white ink in the black resin part, but it doesn't matter if the severity is small as shown in the photo. Wipe away
the white ink spreading out of the nozzle guard and nozzle surface.
Precautions to keep good printing quality/use printer over the long term
Cleaning location
Between the nozzle surface and nozzle guard
Pre-cleaning state
Nozzle surface
Post-cleaning state
Cleaning location
Between the nozzle surface and nozzle guard
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