How do I clean my printheads on my HP Officejet 6600 E AIO? A message came up on screen and it won't show when I click on SHOW ME. The printer was working and there is plenty of ink in the cartridges. This is very very frustrating to say the least.
Remove the inks. There is a plastic release handle on the right side. Lift it and it releases the heads. Take the head assy. to the sink and flush the screens under hot running water. Blot dry with paper towel and reinstall.