I just cleaned 10 kegs yesterday. I filled them w hot water and added DIY PBW. Soaked overnight, dumped, rinsed, and filled one w StarSan. I add a jumper and push out the filled sanitized keg to another. I repeat until all kegs have been filled and emptied. I cutoff all my gas tubes to where they are flush inside the keg. The pressurized kegs are inverted, then I'll completely empty out of the gas poppit. I'll leave them with pressure until they are ready to fill. I too usually do not clean kegs as soon as they are empty. Maybe I should, but I never do as they are never any harder to clean.