code: func Clean(args ...string) error {
  	pwd, err := os.Getwd()
  	if err != nil {
  		return err
  	}
  	args = append(args, pwd)
  	for _, root := range args {
  		if err := store.Clean(root); err != nil {
  			return err
  		}
  	}
  	return nil
  }
docs: // Clean ...