I have one of those wonder washer gizmos. . . um. . . wouldn't buy another one. It is a bit cumbersome to store and actually quite small on the inside. I've done a couple light weight shirts in it. You could probably put in a pair of jeans, maybe. I'm not overly impressed with the cleaning either and I doubt it would clean very dirty items. It doesn't wring anything out and I found that hand rinsing outside the gizmo worked better. And its pricey.

The bucket/plunger/mop squisher would do as nicely I would think. Maybe spring for one of those nice buckets with the twist on covers. Put a hole in the top for the plunger handle. That way if you get overly excited while agitating, you won't slosh all over the floor.