Nah, all the lines are in the freezer so stay chilled, and I’ve never had an issue with anything bad coming out. I mean it’s not weeks passing between pouring beers from them or anything, but sometimes a few days pass where I haven’t pulled anything from the taps. A lot of the bars I’ve known a)have long runs of line and b)the entire run isn’t refrigerated (usually wrapped in some insulation for the unrefrigerated portions), so it’s more likely funky things are going to happen in to those lines without regular cleaning. And sadly I’ve been to far too many bars where they didn’t keep up on cleaning, or even flushing a line that’s sat unused for a bit, and ended up with a pint of, shall we say, sub-par beverage.