Gravity Forms - Don't Save Default Values

snippet.php

add_filter( "gform_save_field_value", "mr_filter_default_values", 10, 4);

// Don't save values when it's the inputs default value
function mr_filter_default_values( $value, $lead, $field, $form ) {
	if (0 == strcmp( $value, $field['defaultValue']) ) {
		$value = '';
	}
	return $value;
}