I've never used the cruise ship laundry (except once to iron a couple of things). I pack a bar of Sunlight soap in a zip lock and wash everything in the bathroom either in the sink or the bath (if there is one). Wring everything as much as possible and then roll tightly in a pool towel. Shirts, dresses, etc go on hangers (from the wardrobe) and hang from shower rail or towel rack and smalls over the shower rail or the in-shower clothes line (if there is one). Everything usually dries overnight. If something is still very slightly damp and I need it, there is always the in room hair dryer. I tend to do the smalls on a daily basis so we are never caught short.