steps are as follows
1. with all other valves closed and your drain line (the co2 line of the keg coupler) on the floor or in a drain, open the valve on the keg to relieve pressure and drain out the remaining beer
2. open valve for rinse water (hot works better) - that's water into manifold, out the hose to the keg coupler, through keg and out drain hose onto floor
3. close valve on keg, place drain hose into the cleaning agent (hot) holding container, turn on pump, open valve to flow cleaning agent into the manifold and into the keg, open valve on keg to allow flow but maintain pressure. run clean cycle
4. use co2 to push all cleaning agent out of keg and back into holding container
5. place drain hose back onto floor or drain, run rinse water cycle.
6. use co2 to push all rinse water from keg
7. set keg aside
Run all kegs through this set up, then swap sanitizer for cleaning agent and run a sani cycle through all the kegs. Push all sani out with co2 and pressurize the keg to storage pressure. Done (go home and cry, wonder why you decided to be a brewer. Remember that you get to brew tomorrow, smile and go to sleep)