WooCommerce: Remove related products info

Add this to your functions.php file:

function woocommerce_remove_related_products(){
    remove_action( 'woocommerce_after_single_product_summary', 'woocommerce_output_related_products', 20);
}
add_action('woocommerce_after_single_product_summary', 'woocommerce_remove_related_products');