public static function clearCache()
    {
        // cache/expensive should be used by the translator adapters.
        $app = Facade::getFacadeApplication();
        $app->make('cache/expensive')->getItem('zend')->clear();

        // Also remove the loaded translation adapters so that old strings are
        // not being used from the adapters already in memory.
        $loc = static::getInstance();
        $loc->removeLoadedTranslatorAdapters();
    }