public function postApply(Varien_Event_Observer $observer)
    {
        $productIds = array();
        foreach ($this->_productIds as $productId) {
            $productIds[] = EcomDev_Varnish_Model_Processor_Product::TAG_PREFIX  . $productId;
        }

        // Run cleaning process separately if amount of stored tags too large
        $chunks = array_chunk(
            $productIds,
            500
        );

        foreach ($chunks as $tags) {
            Mage::getSingleton('ecomdev_varnish/connector')->banTags($tags);
        }

        $this->_productIds = array();
    }