Datamax H Class Operator's Manual page 88

Cotton Swab Procedure (for printers using direct thermal media, or thermal
transfer media and wax ribbon):
1. Perform the "Preliminary Cleaning Steps", as described above.
2. Turn OFF the power switch and unplug the printer. Using a Cotton Swab moistened (not
soaked) with isopropyl alcohol, gently clean the entire printhead surface, until all build-
up is removed.
3. Allow the printhead to dry.
4. Reinstall media (and ribbon, if necessary). Plug in the printer and turn ON the power
switch. Run a few sample labels and examine them. If streaking is still present, go to
"Cleaning Card Procedure" below; otherwise, this completes the procedure.
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