When a product is deleted, this code will work to remove the featured image and gallery images of a WooCommerce product from the WordPress media library

gistfile1.txt

add_action('before_delete_post', function ($post_id) {
    // Check if the post being deleted is a WooCommerce product
    if (get_post_type($post_id) !== 'product') {
        return;
    }

    // Delete the featured image (post thumbnail) if it exists
    $thumbnail_id = get_post_thumbnail_id($post_id);
    if (!empty($thumbnail_id)) {
        wp_delete_attachment($thumbnail_id, true);
    }

    // Get the gallery image IDs and delete them if they exist
    $gallery_images = get_post_meta($post_id, '_product_image_gallery', true);
    if (!empty($gallery_images)) {
        // The gallery image IDs are separated by commas, so we explode them into an array
        $image_ids = explode(',', $gallery_images);
        foreach ($image_ids as $image_id) {
            // Convert each ID to an integer and delete the attachment
            $image_id = intval($image_id);
            if ($image_id) {
                wp_delete_attachment($image_id, true);
            }
        }
    }
}, 10, 1);