Here are the basic parts: Pond Pump with riser attached, large tub, milk crate. I use the pond pump for a recirculating chiller. I had the large tub that I used for soaking bottles and general cleaning or storage. The milk crate? Who doesn't have a few of these around the house.
Here's how I use it: I fill the tub with 5-6 gallons of hot water and my favorite cleaner (Oxyclean, PBW, One Step or whatever I have on hand). I place the pond pump in the middle of the of the tub. I place the crate over the pump, sliding the riser through the bottom. I then place the item being cleaned - be it a bucket, carboy, or keg - over the riser. Plug in the pump and let it go for 10-20 minutes. It's clean as a whistle.