Product review (2 stars): Rather than using something like this, get a washboard
This item is a pain to use! I had one a couple years ago, and I really had high hopes... but after a few times of using it and hating it the entire time, I gave up.

Rather than using something like this, get a washboard, or one of those plunger-style washers and a bucket. Trust me, they'll do just as well and they won't be as awkward to use.