We have a 9890 at our college. During the summer when students are away and the printer will lie idle, I install P-flush using IJM carts. One Initial Fill cycle with P.F. leaves some (rather faint) color in each channel. This year, I've tried adding a normal cleaning after one Initial Fill---with no apparent change in the nozzle check. So I added a low-level clean from the special maintenance menu, then the SC-3 option from that menu. Even after all that, I still see ink color in a nozzle check. I just ran a second Initial Fill, which finally resulted in an all-pink nozzle check.
Is it necessary to purge absolutely all the ink from the lines and head, to achieve safe storage? What has been your experience with Initial Fill with these 44" printers?