I Disavowed Backlinks 6 months ago and ranking improved somewhat but new backlinks are showing as indexed for website like http://answers.yahoo.com Code (markup): backlinks showing as https:// Code (markup): backlinks now and http://uk.answers.yahoo.com Code (markup): backlinks showing as https://answers.yahoo.com Code (markup): backlinks.. Should all earlier Disavowed backlinks be deleted from txt file update with new list of should I let older Disavowed backlinks remain in txt file? Need elaborate discussion regarding this, on how SEO will be effected....
Yes,you could do that if you have previously disavow the links then in place of that add your new .txt file to be disavow, there is no need to consider about the previous disavow .txt file.
@jazzyjmnote is using disavow tool to clean up his profile, but what I'll suggest him is before using the disavow tools try taking it down manually first because using disavow tool has its own disadvantages.