BREWHA's Manual Keg Washer is economical and easy to use. The cleaner can stand alone or be set inside a BREWHA Large fermenter. Once spears are pulled, kegs can be inverted and dropped down onto the cleaner.
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When cleaning multiple kegs, it is simplest to first rinse them all by connecting the Keg Cleaner to tap water (the bottom fermenter port should have a hose ran to a drain). Once all kegs are rinsed, then the fermenter cone can be filled with water, the water heated close to boiling, and a pump connected to recirculate and heat sanitize the kegs with the hot water. (Or, if desired, an alkaline or acidic wash can be circulated through the kegs, the kegs rinsed, and a sanitizer added for the final cycle.)