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I saw a pic somewhere of someone who what looks like a baggie filled with lubricant elastic banded onto the cable, tied shut, lifted straight and left overnight to seep into the cable. I don't know what lubricant exactly to use but you shouldn't use just any oil or it becomes sticky and a dirt magnet over time.
Get a graphite cable lube at the dealer. It'll have a long needle that you can push into the cable a bit and squeeze the lube in. You'll pull the lever to the grip, insert the needle, and lube away. Really pretty simple on the clutch since the end of the cable is accessible with the lever pulled, the throttle cables require a bit more work.
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