I have a sister who lives in Maleny, Queensland, near to Brisbane as you well know, but I live In Switzerland, so the time difference is very annoying for me when trying to contact her.
Anyway, CC doesn't get stuck as such, it is going through the motions of cleaning files but it doesn't even show the percentage now. It used to show 30% which stayed at 30% for days. So, all I can say is that it is definitely going through the files one by one but I have no idea at what stage the cleaning has arrived at - if at all. I only have it on Advanced - Old windows, everything else has been cleaned in the normal way. This will be at least the 4th day of cleaning Advanced Old windows and still there is no indication of where it is at in the process.
Today, I suddenly had a pop up which said that CC could clean something like 5 gigabytes, but the pop up disappeared before I could see it properly to remember exactly what it said to the end.