Just a couple of notes regarding my methods.  The zip-loc bag washing machine is used because we pack all our meals in the zip-locs.  Invariably, halfway through the trip, we have several bags that are clean enough to reuse to wash out dirty clothes.  Therefore, no extra weight, and more importantly, nothing else to purchase.  I guess if I had a waterproof stuff sack, I could use that instead.

I'm not pinching ounces, so I'll stick to a half-dozen clothespins to keep everything on the clothesline.  I'll have to try Kingfisher's suggested method some time soon though.