You can remove the metal inner cable from the sheath without removing the entire cable from the car. Every 5 years or so when my speedo gets bouncy at low speed I remove the inner cable from the speedo side. I clean and soak it with degreaser and a final clean with brake cleaner. I than recoat it with silicon grease and re insert it back through the sheath. This method has worked well for me and saves the cost and aggravation of fitting an entire new cable.
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