How does he clean them? Can you share?
As I recall he has adapted a sankey keg coupler to flush via the spear. No spear removal.
I toured a nano brewery in Peoria a year or so ago. They rigged a PVC CIP stand which they kept in a deep sink and inverted the kegs over that. This did require removal of the spear.
I have had issues with losing a seal on a corny keg- more than twice, but less than 5 times I'd say. That does not count all the times (countless it seems) where I do the Starsan spray/bubbling test and cussed the result, and had to remove and reseat posts or whatever. The bottom line is that there are 6(!) places on a corny keg for a seal to go bad - only one on a sankey keg.