Remove the cable, clean it, and grease it (white lithium grease).
Thanks for all of the great advice and quick replies.
Please forgive me, but I'm not sure what's meant by greasing / lubricating the cable. Do you mean to just disconnect the ends, apply some grease and put it back together? Or should I apply some grease to a rag and wipe it along the length of the cable? Or just spray the cable with something like WD-40?
