Please choose the correct solution to the question: How do you make a tornado in a bottle?

Solution1: Fill the plastic bottle with water until it reaches around three quarters full. Add a few drops of dish scrubbing  liquid. Put the cap on tightly. Turn the bottle upside down and hold it by the neck.

Solution2: Fill the plastic bottle with water until it reaches around three quarters full. Add a few drops of dish washing liquid. Put the cap on tightly. Turn the bottle upside down and hold it by the neck.

Answer format: solution1/solution2
Answer: solution2