Counter::clearCache

static function clearCache($userId = null)
{
	$cache = BitrixMainDataCache::createInstance();
	if ($userId)
	{
		$cache->clean(self::CACHE_NAME.'_'.$userId, self::CACHE_PATH);
	}
	else
	{
		$cache->cleanDir(self::CACHE_PATH);
	}

	return true;
}