According to the first aid guidelines in the Instructions in Writing, what is the immediate action if a corrosive Class 8 substance contacts a crew member's skin?

1. Flush the affected skin area immediately with plenty of running water for at least 15 minutes, remove contaminated clothing, and seek medical advice
2. Apply neutralizing alkaline powder to the skin and cover with dry bandages
3. Apply grease or burn ointment to the skin before rinsing
4. Wrap the affected area in plastic wrap to exclude air