Hello, Mates! I've needed some information about C Cleaner Software: What is DNS Cache, Old Prefetch Data, Windows Size/Location Cache, User Assist History, IIS Log Files, Custom Files and Folders and Wipe Free Space in above image? What will happen if we delete all them through C Cleaner? What is difference between Normal and Secure File deletion in above image? What is the difference between all sub-methods of Secure file deletion if choose one of them? Why people choose Gutmann's method usually? Regards,