You sometime encounter files/directories with none printable characters in the name. In order to remove such files/directories use the inode reference.
First find the inode of the file/directory
ls -il
Output (example):
73302 drwx——. 2 root root 4096 May 14 14:10 05??
Remove the directory and all content:
find . -inum 73302 -exec rm -rfi {} \;
You can leave the i (interactive) if you don't want any questions
http://www.cyberciti.biz/tips/delete-remove-files-with-inode-number.html