git-clean(1) - Remove untracked files from the working tree
    Remove untracked directories in addition to untracked files. If an untracked directory is managed by
    a different git repository, it is not removed by default. Use -f option twice if you really want to
    remove such a directory.
-f, --force
    If the git configuration variable clean.requireForce is not set to false, git clean will refuse to
    run unless given -f or -n.
-n, --dry-run
    Don’t actually remove anything, just show what would be done.
-q, --quiet
    Be quiet, only report errors, but not the files that are successfully removed.
-e <pattern>, --exclude=<pattern>
    In addition to those found in .gitignore (per directory) and $GIT_DIR/info/exclude, also consider
    these patterns to be in the set of the ignore rules in effect.
    Don’t use the standard ignore rules read from .gitignore (per directory) and $GIT_DIR/info/exclude,
    but do still use the ignore rules given with -e options. This allows removing all untracked files,
    including build products. This can be used (possibly in conjunction with git reset) to create a
    pristine working directory to test a clean build.
    Remove only files ignored by git. This may be useful to rebuild everything from scratch, but keep
    manually created files.