I have been running Karmic since October and I did re-install once in December after I ruined my video trying to improve the drivers. So now I ask the question will Computer Janitor ever show items I can delete? I posted the same question in a Craigslist Linux forum and really didn't get the answers I wanted. I was however told of another program Bleach, that is in the Karmic Koala repositories and is more robust. I have installed Bleach and I used it once. There are several options that have deletable items and the program sports a preview option. I will have to try out more options and report the results later.
Does anyone else have any experience with Computer Janitor, Bleach or other programs that do the same things? I would like to hear about them in the comments.