Thank you all for the replies. I had loaded new cartridges after I cleaned the head the first time, so I should be good to go there. I will try the power washing, and if it doesn't work, let the head soak for awhile.
I have a IP4300 that is several years old, and has been sitting unused for about six months. Foolishly, I let it sit rather than printing an occasional page or two. I left the cartridges in the head thinking it would be best to keep ink from drying on the screens, but drying of the ink in the...