Whitworths Marine: Magic Wash Portable Washing Machine
is what the handwasher (Magic Wash) is - I just bought ours at the local camping/outdoors store before we went. When it was empty it fit the washing line/pegs and Ecologic detergent in it.
If we had a few pooey nappies (once scraped/squirted/shaken) I'd stick them in there with the rinse water from the dishes (have to cart all your own water so reused wherever we could) and let them agitate as we bumped over the track for the day. Rinse, then hang. Rinse water was usually from rinsing veges/washing hands etc, and then was used as the wash water the next time so three uses really from one lot of water.
Other than that just hand wash in a bucket was all we did.
And laugh about the places you get to do cloth advocacy - at the bottom of
Bell Gorge lol about an hour (ish?) walk in from the main parking spot, then you have to get down the side of the gorge to the bottom which took a little longer with Zeke in the Ergo and helping Brooke and Jake down. A French couple and their daughter lol and there I was with advocacy cards (Ergo pocket

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