Product review (5 stars): Ingenious design!
Do not let the plunger styling fool you. This is truly ingenious. I initially purchased it to felt hand-knit items by hand, but I've also used it to wash my clothes. Rather than simply moving your clothes around in soapy water, this is designed to draw the soapy water *through* the fabric to get them clean. Really a wonderful tool.

Tips: Get a nice large plastic tub. Fill it only with 4-6" water and your laundry detergent. Don't try to put too many clothes in there at a time. You need room to breathe and let it do its job.

While using it, the handle will come unscrewed from the force and motion. Just tighten it back up when you notice.