When you have files in your .gitignore they won't be considered for changes, but still you might want to get rid of them, e.g. because they clutter your file system.

Rails Long Term Support

Rails LTS provides security patches for old versions of Ruby on Rails (2.3, 3.2, 4.2 and 5.2)

• Prevents you from data breaches and liability risks
• Upgrade at your own pace
• Works with modern Rubies

Read more Show archive.org snapshot

While a regular git clean will ignore them as well, passing the -x switch changes that:

git clean -x

If you want to see what would happen first, make sure to pass the -n switch for a dry run:

git clean -xn

Clean even harder by passing the -f (force cleaning under certain circumstances; I think this is also required by default) or -d (removes directories) switches:

git clean -xdf

Careful: You may be ignoring local config files like database.yml which would also be removed. Use at your own risk.