If thats the original cable, I`d look/shop for a replacement. Cleaning that one you have is a good start. It could have had powder graphite in and spray lube got in there and made a mess.
~ BD. "You won't find me in an old folks home" Pioneer Florida Cracker 1958 Apache Stepside 1958 Apache 1/2 ton Panel 1959 Apache 1/2 ton Panel
