I've used the 5 Gal bucket washing machine for a few years now even before we got the Casita
. I got the bucket with lid from Home Depot, add clothes, max about 2 pair of jeans or equifilant, add hot/warm water to about 3/4th full, add small amount of laundry soap. Close lid and shake. We'd put it in the back of the Jeep when we would go out exploring.
Now I put it in the Casita
, fit's perfect under the Swivel seat, and I bungee it to the leg of the chair. I did most of our laundry this way, on our "Travel" days when we went across country to Yellowstone. Only used a laundry mat once.
Bouncing around in an empty bucket doesn't dry them though, so I always had to make sure we were going to have a clothes line when we stopped for the night. And then hope it didn't rain.