I used:
DELETE FROM `wp_options` WHERE `option_name` LIKE ('%\_transient\_%');
to cleanup with great results :)
(from here http://stackoverflow.com/questions/10422574/can-i-remove-transients-in-the-wp-options-table-of-my-wordpress-installhttps://stackoverflow.com/questions/10422574/can-i-remove-transients-in-the-wp-options-table-of-my-wordpress-install)