What is the best way to: How to clean a cast iron skillet safely.

OPT:
i. Sprinkle generous amount of sea salt to the skillet. Cut a raw potato in half. Scrub the skillet with the cut side of the potato. Rinse with water and dry with paper towel..
ii. Sprinkle generous amount of powder sugar to the skillet. Cut a raw potato in half. Scrub the skillet with the cut side of the potato. Rinse with water and dry with paper towel..
Answer:
i.