// reseting a form set it back to his original value.
(function ($) {
  $.fn.reset = function () {
    $(this).each(function () {
      this.reset();
    });

    return this;
  };
}(jQuery));

// cleaning a form set it to an empty string or false. You can also set a default value.
(function ($) {
  $.fn.clean = function (default_value) {
    default_value = default_value || false;

    $(this).filter('select').find('option').removeAttr('selected');
    $(this).filter(':checkbox').attr('checked', false);

    if (default_value) {
      $(this).filter(':input:not(:checkbox)').each(function () {
        $(this).val(this.defaultValue);
      });
    } else {
      $(this).filter(':input:not(:submit, :button, :reset, :checkbox, :radio)').val('');
    }
    return this;
  };
}(jQuery));