Finish the following sentence with the best choice: How to clean a cast iron skillet safely.

Choices:
- 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.
- 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:
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.