How to remove all product image in magento ?

<?php
require_once '../app/Mage.php';
set_time_limit(0);
ini_set('memory_limit','1024M');
umask(0);
Mage::app('admin');
Mage::setIsDeveloperMode(true);

$productCollection=Mage::getResourceModel('catalog/product_collection');
foreach($productCollection as $product)
{
    echo $product->getId();
    echo "<br/>";
    $MediaDir=Mage::getConfig()->getOptions()->getMediaDir();
    echo $MediaCatalogDir=$MediaDir .DS . 'catalog' . DS . 'product';
    echo "<br/>";

    $MediaGallery=Mage::getModel('catalog/product_attribute_media_api')->items($product->getId());
    echo "<pre>";
    print_r($MediaGallery);
    echo "</pre>";

    foreach($MediaGallery as $eachImge){
        $MediaDir=Mage::getConfig()->getOptions()->getMediaDir();
        $MediaCatalogDir=$MediaDir .DS . 'catalog' . DS . 'product';
        $DirImagePath=str_replace("/",DS,$eachImge['file']);
        $DirImagePath=$DirImagePath;
        // remove file from Dir
        $io     = new Varien_Io_File();
        $io->rm($MediaCatalogDir.$DirImagePath);

        $remove=Mage::getModel('catalog/product_attribute_media_api')->remove($product->getId(),$eachImge['file']);
    }
}
?>