Deleting files in Windows 10 does not really delete the file. Security best practice requires deleted files to be completely overwritten more than once.

Learn how to delete Windows Update Delivery Optimization Files & reclaim lost disk space on Windows 11/10 PC using Disk Cleanup.

Meeting DoD standards for securely deleting files in Windows 11 requires the use of a special application. Fortunately, Microsoft provides one for free in Sysinternals.