The only ships I've been on in recent years that irons available to the public are on Carnival. Some of the others may have washer/dryers available but I've not seen a non-CCL iron in many years. Pack your clothes in dry cleaning bags and it will prevent wrinkling. What causes the wrinkles are clothes rubbing against one another. Be sure to use bags without writing on them if they will be next to light colored clothing. Tissue paper will work also but dry cleaning bags are easier to use.