upload the following code to the root directory of your website's folder and save it as clearcache.php, credits for this scripts goes to autotron.
Code:
<?php
/**
* @author autotron
* @copyright 2010
*/
//clear cache
$memcache = new Memcache;
$memcache->connect("localhost",11211);
$memcache->flush();
//print_r($memcache->getStats());
header("Location: {$INSTALLER09['baseurl']}/index.php");
?>
Hope this helps :)