I just wipe it gently with a microfiber cloth.
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I've had experience with the shorter flash cords which really dont allow much freedom other than macro applications and brackets... PC cords are a bit archaic and temperamental at times, but works if needed. The longer 30 feet cords mentioned above sounds interesting but I wouldn't be thrilled having a long thick spiral cord attaching my camera to a flash 30 something feet away... seems more like a liability than a help and would at that point almost prefer a second flash for a master/slave thing rather than going that route but that's just me.