…I have not run it yet because it does not mention CS6 specifically as one of the versions it "cleans", and I would rather not "clean" my current install of CS5.5.
Very wise decision!
Stay the heck away from that Cleaner Tool. From the above link:
The Adobe Creative Suite Cleaner Tool helps resolve installation problems for Adobe Creative Suite 5 - 5.5, Adobe Creative Suite 4, and Adobe Creative Suite 3 software. The tool can clean up install records for any pre-release (beta) installations of these Creative Suite products.
We are tracking this issue at: http://forums.adobe.com/thread/978912?tstart=30.
I will lock this particular thread and forward your issue to the installation guys . They will check the link above for your information and get back to you there.
I suggest you copy your issue there and an intstallation expert can help determine if the cleanter tool is appropriate for your situation.
Please note whether it is a MAC or PC and what OS you are running.
Thanks and sorry you are having issues.