WPBakery and Media Library

Hi all
I use WPBakery for my layout on my photographic site and over the years my media library has grown huge. I’ve been trying to find a quick way to delete images that are not used on my site. But there seems to be no plugins or solutions directly related to this problem. None of the media cleaning plugins I’ve tried seem reliable. Is there a quick way to search my library and remove these unused images?
In my media library all images are listed as unattached so I have no idea how else to delete unused files there.
Thanks
Vishy