I just did this yesterday, went out to refill my washer fluid and the hood cable pull was *frigging tight*. I set the hood up as high as it would go, sprayed some PB around the latching area where the cable goes, then into the latches them selves, working the bar the whole time, once it freed up loose I hit with some some royal purple synthetic spray then took my little can of graphite lock ease with the plastic nozzle on it and let it dribble down the cable, little squirts, after about 5 minutes of that my hood release feels much better now. Oh, then I hit the latches with lithium spray grease.
Then for good measure I hit the rubber door seals on all the jeeps with silicone spray, I hate frozen doors...