Soft cloth after playing, this once a week; http://thestringcleaner.com/
I also take an electric duster/blower to the neck and pegs once a week.
"It takes a lot of devotion and work, or maybe I should say play, because if you love it, that's what it amounts to. I haven't found any shortcuts, and I've been looking for a long time."
-- Chet Atkins
-- Chet Atkins