Created by: KENT
Are you worrying about the issue of growing database or memory that is caused by the existence of unnecessary images or metabox of removed posts?
Now Sky Remove Attached Files And Featured Images Automatically plugin helps you solve this problem. Moreover, this tool is also used for custom post type. Before you remove posts, images uploaded via “Add Media” will automatically be eliminated. Besides, all metaboxes and featured images of those posts will also be removed quickly
So Why don`t you try activating the plugin and rate 5 stars if it avails.
Forum: http://forum.skygame.mobi