Cleaner for Instagram is the best Account Manager you can use to mass unfollow Instagram users. You can also mass block Instagram followers, mass delete Instagram posts and mass unlike Instagram photos or videos.
Here are all the app features:
* Mass unfollow
* Mass block and unblock
* Mass delete posts
* Mass download posts for backup
* Mass unlike posts
* Quick selection tools
* Pending Actions Service (app continues to work in background)
* Cloud Service (app can be closed, our servers work for you)
* Whitelist Manager (avoid accidental unfollows or blocks)
* Support for filters, multiple accounts
* Activity log with undo option
* Activity statistics
* Help Center
Disclaimer: 'Cleaner for Instagram' is a third party companion app for Instagram and is not affiliated with Instagram/Facebook Inc.