When my keg was empty and I was taking it out of my freezer to clean it I noticed that my co2 line has some beer that some how got forces up into it. I filled my keg with a no rinse cleaner ,pressures up my keg and cut my line of the barb fitting before it went into the regular and tipped the keg on the side. I ran as much cleaner back through the lines till the take ran out of pressure. . . The lines look ok now. Would anyone dare guess if this is sufficient enough to get those lines cleaned out. Thanks.