Recently my Canon PIXMA iP4200 started "printing" a 1/2 inch wide vertical streak all the way down the middle of the back side of my printouts. If the printer sits without use for awhile, the streak is really heavy and dark, so heavy the ink is still wet. As I print a few pages, the streak gets lighter and lighter until barely noticeable. It happens with a low black cartridges and new full cartridges. I've cleaned the area inside with alcohol (the white rollers and the little tray where there was some stray ink). That didn't help, this steak is THICK, not just residue. Any help is appreciated!
