Glad to hear you got it running! It has been a very good printer for us.
I picked up a 7600 3 years ago for next to nothing. Magenta and yellow lines were full of hard ink. Black was semi clogged. I mixed up some cleaning solution and flushed the black lines using refillable carts and the epson with the "ink change" program. It flushes a massive amount of ink through, much more than a power cleaning.
That cleaning fluid would work fine i'm sure, but I make my own cleaning solution with distilled water, ammonia, and isopropyl alcohol.
Mix ammonia 1:9 with distilled water. Add two parts 91% iso alcohol and fill er up. Been running this for two years. No issues so far, but I haven't tried to print anything through the non black channels either. We have been running a roll of 17" film on this printer every 10 days or so.
For ink, you want dye based.
I use this, but I'm sure there are others that work just as well.
http://www.filmdirectonline.com/products/FD-Dye-Black-Ink.html