Software long gone

Why is it that CCleaner is scanning, or trying to scan programs long since deleted? A way to clean it up?

the program may be uninstalled but a file, folder or reg key for it still exists which is triggering CC into believing the program still needs cleaning.

run CC with the /export switch.

in the generated .ini files, open them with a text editor and search for your deleted program to see what CC is using as the trigger.