如果我正确理解，您要删除与特定用户关联的所有愿望清单项目吗? ...

If i understand correctly, you want to delete all wishlist items associated with a particular user? ...

$customerId = 1; // Replace with the customer id you are targetting

$itemCollection = Mage::getModel('wishlist/item')->getCollection()
    ->addCustomerIdFilter($customerId);

foreach($itemCollection as $item) {
    $item->delete();
}