The photographs from my Cannon S900 have lines

Hi Trevor, if you check Canon's website they have a service centre run by a third party. They are pretty quick but not exactly cheap.
Have you done a head alignment print? It may be that the alignment is off and that's causing the line.
Do a nozzle check and see if any of the horizontal lines are missing anywhere (they are not meant to be straight - in case you were wondering).
I could be that despite your deep cleaning, one of the nozzles is not firing.