Simply copy and paste the script into the Chrome or Firebug console, the script will guide you through the rest. Get started below.
Copy the following script to your clipbaord:
Open twitter.com/followers in a new tab.
Open up the Chrome console, paste the script, hit enter on your keyboard, and you'll be guided from there.
This script is best at removing groups of fake followers, it was built for people that have 500 or more fake followers. So if you've purchased fake followers and have buyers remorse this will work great for you.
This script is less efficient at finding individual fake followers surrounded by real followers. For the average twitter user that has between 100 and 1000 followers, that hasn't purchased fake followers, you're results may not be as accurate. However, when you use the script it will highlight for you who it's going to remove before actually removing them, so go ahead and give it a shot anyways!
At a high level this works by scraping the followers page and collecting information about each of your followers (eg number of followers they have, number of people they are following, and the number of times they've tweeted). This information is then run through a very simple algorithm to decide if the user is fake or not.
All personal information is kept private, the only information that is tracked is the number of followers you delete, how many followers you had at the beginning, and how long it takes for you to finish. Collecting this data helps me improve the script.