How to Delete Unused Tag in WordPress

After playing with auto grab content plugin, I found so many (2000+) unused tags in my WordPress.

To clean up all of it, just install Mass Delete Unused Tags plugin.

1. Login to WordPress as administrator.
2. Go to Plugins => Add New
3. Search for: Mass Delete Unused Tags
4. Click Install and Activate
5. You can find the link at Plugins => Delete all unused tags