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I don't always clean them as often as I should, but when I do, I pull the inner silicone bung off just to make sure to get into all of the nooks and crevices. They get ugly looking.
Well that's not very encouraging. I run oxiclean through the lines after a keg kicks, let it sit for a bit, then rinse with water. Then run Starsan through. So my lines are probably gunked up then...