remove unwanted files from git of gitignore

It is as simple as 

Website link : https://stackoverflow.com/questions/46273032/is-there-a-way-to-remove-all-ignored-files-from-a-git-repo/46273201

git clean -dfX

git-clean - Remove untracked files from the working tree
-d for removing directories
-f remove forcefully
-n Don’t actually remove anything, just show what would be done.
-X Remove only files ignored by Git. This may be useful to rebuild everything from scratch, but keep manually created files.