I actually thought that I had come to that conclusion several years ago when I was trying to get her going before ;)... BUT, then I came across this from Canon, and thought there might be hope!
https://support.usa.canon.com/kb/index?page=content&id=ART167770
And, I got it to come half way out...
I'm glad to see that this thread is still going! I have a Pro-1 that's been idle for about 5 years now, because it was giving me sketchy output of my photo gray (tough to print quality photos without it...).
I previously did SEVERAL cleaning cycles to no avail. I believe my problem might have...