public function sendClearDirty($categories)
    {
        $msgId = $this->createIqId();

        $catnodes = [];
        foreach ($categories as $category) {
            $catnode = new ProtocolNode('clean', ['type' => $category], null, null);
            $catnodes[] = $catnode;
        }
        $node = new ProtocolNode('iq',
            [
                'id'    => $msgId,
                'type'  => 'set',
                'to'    => Constants::WHATSAPP_SERVER,
                'xmlns' => 'urn:xmpp:whatsapp:dirty',
            ], $catnodes, null);

        $this->sendNode($node);
    }