Many times while creating pages and posts a user will add images to the uploads folder that they end up not using. If you want to keep a clean uploads folder, from time to time you’ll want to delete all of your unused images.
The Upload Janitor plugin makes it really easy to backup and clean out your unused images.
This plugin will identify unused files within your uploads folder, and give you the option of archiving then deleting some or all of these files.
Before any action is taken, Upload Janitor will automatically make a ‘tar’ archive of all files to be erased, including their original paths, so you can restore if necessary.
Free up some of your disk space on your WordPress installations by beginning a new habit of cleaning your uploads folders.
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June 16, 2010 
Sarah Gooding on Google+
Pingback: Daily Tip: Keep a Clean WordPress Uploads Folder by Deleting … « Wordpress for Business
Would’ve been a very good plugin since I use a lot of images for my blog and sometimes can’t keep track of what I upload. Somehow it’s not working for me. I think it is in conflict with another plugin I’m using. Back to manually finding unused images and deleting em. :D
Does not work on Windows as it uses the tar command. Also deleted files which were being used on an MU install. One to avoid.
First, this runs on the server, so Windows doesn’t even come into play. Second, you most certainly can use tar on Windows. Numerous programs, including 7-zip, allow you to create, view, and extract from tar files. Check your facts before complaining.
Also it does not check for featured images, so if you have a featured image that you do not use directly in a post or a page as well, it get’s deleted
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I think this plugin can help you better for delete all unused image in wordpress http://wordpress.org/extend/plugins/dnui-delete-not-used-image-wordpress/
You can also test this one : http://wordpress.org/extend/plugins/wordpress-uploaded-files-cleaner/