Airhog, I think you were supposed to wash your underwear really well, first, before you put it in the salad spinner.
We had one of those "wonder wash" canisters once-- the manual, hand-crank system that looks like R2D2. I think we got it through a Lehman's catalogue, in their section on items designed for overseas missionaries. Although small, it did wash clothes fairly well, although it didn't spin-dry. Unfortunately after several uses, the threads were stripping out on the top, where you have to screw on the cap. Tightly. After it began spewing sudsy water all over the place with a few turns of the handle, we gave up on it.
I really don't like Laundromats any more than I like dentist offices, but some RV parks are getting downright persnickety about letting folks hang out the wash on a clothesline to dry.
My solution has been to find ways to cut down on laundry in the first place, like buying dark sturdy underwear that can go in the washer with the jeans, so no separate loads are needed for lights, darks, delicates, or sturdy. Also, they're a lot more discrete than itsy-bitsies when pegged to a clothesline in a CG. When packing, all clothes must go with all other clothes, colour-wise. A really effective and cheap underarm deodorant powder and clothes-odour freshener is ordinary baking soda mixed with a little deodorant (or good-smelling) bath powder, at a ratio of about 3 or 4 to 1. This doesn't harm the clothes.
Re: Paula's back-of-the-truck wash & rinse cycles.... when I was a kid and my family took long road trips, my mother would sometimes wash out a few small items by hand, and then roll up the car windows on them, so that they would flap in the breeze, going down the highway at 65 mph, or whatever. Kind of embarrassing, but it did work. Funny, you don't see anybody doing that today.