Always that I run the cleaner and "all" gets cleaned without analyze before... I usually do an analyze to see if CCleaner is missing to delete something and I have seen a bug for awhile through the latest 3 o 4 versions... The prefetch files don't get cleaned... look my screenshot for more information...
Note: I have passed the cleaner again after seen this missed files and nothing got cleaned as they don't exist... but if you go to the folder they do actually...