My Epson 600 is printing very poorly. I tried new ink cartridges and the head cleaning utility. Still prints badly. I am using only Epson inks. It is used only about once a month, so maybe the ink is all crusted and dried up? Can I take it apart and use a solvent to clean them? If so, what is recommended? Or is it time for a new printer? this one is about 5 years old.