Why some files cannot be cleaned?
Only files infected by viruses can be disinfected. Virus will attach itself to another file and that file can normally be cleaned.
If you have for example a Trojan, Joke, Worm or Backdoor in your computer, you may Rename or Delete the unwanted file but Disinfect cannot be done.
How to remove those files that cannot be cleaned / disinfected?
To remove content that cannot be disinfected (like a Trojan, a Joke, a Worm and a Backdoor), you may change your Anti-Virus settings to ask the action after infected file is found. Change "Action to take on infected files = Ask after scan" and then scan your computer hard drives. Then if infections are found, you may select "Delete" for those infected files you want to remove permanently.
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