<human>: Goal: How to remove rust from a cast iron pan?

Which of the following methods is more reasonable for accomplishing this goal?

OPTIONS:
- Cut a raw potato in half width wise, pour 2 tablespoons of salt in the pan and firmly scrub the rust with the potato until clean or the end of the potato gets slick then cut off and keep scrubbing.  When the rust is gone rinse the pan, dry it and coat with 2 tablespoons of canola oil to season.
- Cut a raw potato in half width wise, pour 2 tablespoons of salt in the pan and firmly scrub the rust with the potato until clean or the end of the potato gets slick then cut off and keep scrubbing.  When the rust is gone soak the pan, let sit overnight then coat with 2 tablespoons of canola oil to season.
<bot>: Cut a raw potato in half width wise, pour 2 tablespoons of salt in the pan and firmly scrub the rust with the potato until clean or the end of the potato gets slick then cut off and keep scrubbing.  When the rust is gone rinse the pan, dry it and coat with 2 tablespoons of canola oil to season.