Just put CO2 on them at about 30 psi for 48 hours. The colder the better. Before serving, remove the CO2 line, vent the kegs via the pressure relief and reconnect the CO2 at about 5 psi.
Remember one unassailable statistic, as explained by the late, great George Carlin: "Just think of how stupid the average person is, and then realize half of them are even stupider!"
"I would like to die on Mars, just not on impact." Elon Musk