public static function delete_all_data() {
		// During uninstall.php runs, the main plugin file is not loaded.
		if ( ! defined( 'INVP_PLUGIN_FILE_PATH' ) ) {
			define( 'INVP_PLUGIN_FILE_PATH', dirname( __DIR__ ) . '/inventory-presser.php' );
		}

		// delete all the vehicles.
		self::delete_all_inventory();

		// delete unattached photos with meta keys that identify them as vehicle photos.
		self::delete_attachment_orphans();

		// delete pages created during activation.
		// uninstall.php doesn't load the whole plugin but calls this method.
		if ( ! class_exists( 'Inventory_Presser_Allow_Inventory_As_Home_Page' ) ) {
			include_once plugin_dir_path( INVP_PLUGIN_FILE_PATH ) . 'includes/class-allow-inventory-as-home-page.php';
		}
		Inventory_Presser_Allow_Inventory_As_Home_Page::delete_pages();

		// delete all terms.
		if ( ! is_multisite() ) {
			self::delete_all_terms_on_blog();

			// delete the option where all this plugin's settings are stored.
			delete_option( self::OPTION_NAME );
		} else {
			$sites = get_sites(
				array(
					'network' => 1,
					'limit'   => apply_filters( 'invp_query_limit', 1000, __METHOD__ ),
				)
			);
			foreach ( $sites as $site ) {
				switch_to_blog( $site->blog_id );

				self::delete_all_terms_on_blog();

				// delete the option where all this plugin's settings are stored.
				delete_option( self::OPTION_NAME );

				restore_current_blog();
			}
		}

		do_action( 'invp_delete_all_data' );
	}