We used the Wonder Wash from laundry alternative for 6 months solid when we were in an apartment without electric washing machines. I used it to wash 2 adults and a baby's clothes and cloth diapers. I did about 3 loads per day, and it took me about an hour total, including hand-wringing (no spinner), while tending to a young baby. It was hard work, but definitely worth not hauling laundry to a laundrymat and spending quarters.
The handle broke off at the 6 month mark, and there were cracks in the plastic lid by then, but those didn't affect how it functioned. I used it for another month or so just spinning it by hand without the handle, but that was REALLY tiresome.
Another method is to use a clean plunger in the bathtub to force the soap through the clothes. I've done this when I had things too big to fit in the Wonder Wash (like queen sized sheets and blankets).
Yet another method that I've read about but never tried is to use a 5 gallon bucket with a tight fitting lid that has a 1-inch diameter hole cut into the middle. Put the lid on over a plunger. Plunge up and down to clean the clothes.
In all of this, I have never found it difficult to get clothes clean. I always find it incredibly tedious to rinse and wring thoroughly. If you can hang clothes outdoors, you don't need to wring quite so well (would you really need a spinner?), but if you don't, the clothes are kind of crispy after drying.