Please choose the correct solution to the question: How can you clear rust off a screw or nut head?

Solution1: 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.

Solution2: 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 format: solution1/solution2