There are some steps to delete a simple product through code.
1) Firstly include the Mage.php file.
2) after that load product id into the product model.
3) call the delete method to delete the product.
require_once('app/Mage.php'); //Path to Magento
umask(0);
Mage::app();
Mage::register("isSecureArea", true);
$productId=24; //product id
try{
Mage::getModel("catalog/product")->load($productId)->delete();
echo 'delete';
}catch(Exception $e){
Mage::log($e->getMessage());
}