Isopropyl alcohol
The printing depends on the smooth flow of ink, which can be hindered if the ink begins to dry at the print head, as can happen when an ink level becomes low. Dried ink can be cleaned from a cartridge print head using 91% denatured isopropyl alcohol (not rubbing alcohol). Isopropyl alcohol does not damage the susceptible sponge that is vital in transferring ink to paper. But it is strong enough to dissolve clogs. It must be administered carefully with a dropper or a syringe. Tap water contains contaminants that may clog the print head, so distilled water and a lint-free cloth is recommended.