Finish the following sentence with the best choice: How can you clear rust off a screw or nut head?

Choices:
- Pour Cocoa powder on it, let sit a few min, then clean off, repeat until rust removed from grooves of the head of the screw.
- Pour Coca Cola on it, let sit a few min, then clean off, repeat until rust removed from grooves of the head of the screw.

Answer:
Pour Coca Cola on it, let sit a few min, then clean off, repeat until rust removed from grooves of the head of the screw.