Check out this article which addresses the details:
http://www.hardwaresecrets.com/article/178/
You can contact us at DTG Printer Parts and we'll thoroughly clean your print head for you. We have special machines that make it reasonable for you and properly clean them. We have cleaned Epson, Kornit and many other print heads. Email us at dtgsupplies@gmail.com so we can answer any questions that you have. The diagram is correct at the above link but you should consult a professional before you do it yourself.