I only drink my beer at the weekends so on a Sunday I'll remove the beer disconnect from the top of the keg, give the disconnect a quick spray inside with Starsan and leave it dangling inside the keezer. This keeps the beer in the keg fresh. Next weekend I'll pop the disconnect back on and run a couple of fingers of beer through to clear the stale stuff in the lines.With serving beer lines, how often do you clean it? I guess if it not used in couple days it can go bad and affect all beer your pour?
Actual line cleaning is done in-between kegs. I flush with PBW from the keg being cleaned, leave to soak for a couple of hours, flush with water and leave the water in the line until the next time the keg is filled. Because the empty keg gets a Starsan rinse before filling I push some of that through the lines and leave it in there for the 2-3 weeks of conditioning and carbonating. Then it's over to the beer again which starts off by pushing out the Starsan. Easy!!