my system is MBP 13 inch Late 2011 Mac OS X El Capitan. What does CCleaner do on applications? By default they where all unchecked. Is it safe to clean up my iTunes without affecting my songs, songs playlist, genius playlist, apps, videos, podcast? According to CCleaner Analyze I have my Applications - iTunes 16,434,084 KB 1732 Files. Should I run the CCleaner?