I was so inspired by McMullan's keg washer I hauled mine out to clean kegs. Mine sits in the brewery sink that has PBW and hot water. Quarter HP submersible pump installed in a five gallon pail with drilled holes.
The keg washer is getting so much use I'm now calling it 'brewery washer'. It's being used for my cask, kegs, FVs, yeast trough, silicone hose, fittings, anything that fits in there really. It uses 3L hot PBW, which can be reheated on the kitchen hob, if required. I use 4L when cleaning the CFC.