$ dotnet tool install dotnet-nuget-gc -g

usage: dotnet nuget-gc [options]

Options:
  -f, --force                Performs the actual clean-up. Default is to do a
                             dry-run and report the clean-up that would be
                             done.
  -m, --min-days=VALUE       Number of days a package must not be used in order
                             to be purged from the cache. Defaults to 30.
  -?, -h, --help             show this message and exit