Sandboxie Support

In the past I've included C:\Sandbox\username\*.* in CCleaner's removal cue (and specified to include all files, subfolders, and the folder itself).

At times in the past, after running CCleaner I've noticed some files left in the sandbox, and I'm not exactly sure why this happens. Can someone please recommend the best inclusion setting in CCleaner to perform a secure delete of all sandbox contents?

Sandboxie should be listed in CCleaner for deleting sandbox contents when box is checked.
(CCleaner > Applications > Utilities > Sandboxie)

If you have added C:\Sandbox\username\*.* in CCleaner it should delete all sandbox contents
as well.

You can also use Sandboxie Delete Command
(Sandboxie Control > Sandbox > [name of sandbox] > Sandbox Settings > Delete > Delete Command
Type in the install path of CCleaner (with quote marks)

ex:) "C:\Program Files\CCleaner\CCleaner.exe" /delete "%SANDBOX%"

Make sure you have Sandboxie Delete Invocation (Automatically delete contents of sandbox)
checked in Sandboxie. You should get a popup window from CCleaner asking you if you wish to
proceed. Click yes if you want to automatically delete all sandbox contents.