This is pretty simple.
I will give you the url of the unfollow website. You enter my Twitter login info. Pictures of all the Twitters i follow who are not following me appear - see attached photo 1. You click on each photo, then there is a dropdown menu to unfollow. And that's it.? Takes a couple of seconds.? I want you to unfollow all of them -about 300.
See attached screenshots to unfollow