The reason for failure in reconsideration requests for partial matches or full penalty is because that the web owner might not have able to remove/disavow all the manipulative/spammy links. The web owners always want to save the good links pointing to their site which sometimes could be a bad one in Google’s point of view.
Finding and sorting out all the manipulative/spammy backlinks will be a difficult task when it comes to a good old site with huge number of backlinks. Here is a blog that simplifies the link sorting process using the help of several tools and tactics.
Read on @ https://www.techwyse.com/blog/internet-marketing/disavow-how-to-find-unnatural-links-to-your-site/