You can buy a small packet of laundry detergent or put some detergent in a small plastic bottle. A small amount in your cabins sink will wash a few article of clothes. There is a retractable line in your shower stall for drying. If you have a balcony, clothes over the back of a chair will dry in a couple of hours if the sun is on them. The ship offers a wash & fold service which is all you can stuff in a small laundry bag. The charge was $25 on the Mariner last week. If you pack you clothes in plastic bags you probably won't have any wrinkles. A portable steamer works great if you need to get a few wrinkles out.