How do I permanently delete downloaded files?

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Tags

1. #options
2. #security
3. #drive
4. #entire
5. #eviscerate
6. #choosing
7. #erase
8. #finder
9. #entering
10. #files
11. #trash
12. #empty
13. #utility
14. #secure
15. #click
16. #securely
17. #whichever