If you are the server admin, just ssh into the server and go to the users home directory.
Once inside the public_html folder you can use the rm command to delete files eg..
Code:
#rm filename
If you want to delete folders with content still in them, you can use this command:
Code:
#rm -rf foldername
This will deletd the folder and all content with in it. Do not delete the user's account / home directory this way. Go back into DA and Delete the user after you have removed the content that you want to get rid of.
*Note that you will need to change the appropriate name for files, folders and user account to use those commands.