<human>: What is the best way to: how do you wash cast iron skillets?

OPTIONS:
- clean them with water alone, and then heat them up over the stove with a bit of oil to dry them.
- clean them with water and soap and then heat them up over the stove to dry them.
<bot>: clean them with water alone, and then heat them up over the stove with a bit of oil to dry them.