I fill a bucket with some water and soap (I prefer Method Concentrated Laundry Detergent - buy before you leave though as you will not find this in the islands), put the dirty clothes in from the day before, allow to soak for an hour or two or longer (sometimes overnight). If the load is particularly dirty I will add some Borax powder as a detergent booster. I then intermittently agitate the water with my feet (think Lucille Ball from the famous grape stomping episode) for about two minutes each time to work out any grime. If some clothes need spot treatment, I will use a little stain remover, letting it set for as long as needed, and scrub with a hand brush. Once I am convinced they are clean - I will rinse each item individually on our aft deck with our shower hose and wring each piece out individually. Wringing small clothes is easy, but things like towels, sheets or sarongs are more tricky. What I do is fold these bigger items in half, stand with a foot on one end and begin twisting with my hands until the item is one tightly wound band that goes from my hands to my feet. I then give each item a vigorous shake and hang out on the lifelines to dry, making sure to use at least two old-school wooden clothespins on each item (three or four on towels or sarongs). In the constant breeze and hot Caribbean sun, this takes no more than an hour or two. So far, this has produced great smelling, clean clothes.