As an added bonus, you can securely shred sensitive or confidential folders and files so that they can't be recovered. Another entry called Deep scan dives into hidden and orphaned files, backup files, and other leftover files. Shred folders or files Deleting a folder or file in Windows doesn't physically remove the data from your hard drive. To do this, click the icon in the upper left and select "Shred Files" or "Shred Folders" from the menu. Overall, BleachBit is an effective way to selectively free up disk space and securely erase confidential files.