Please choose the correct solution to the question: How do I refill a foaming hand-soap container with regular liquid soap?

Solution1: You need to fill the container with about 2/3 liquid soap and then add water to the top. Now, it will foam.

Solution2: You need to fill the container with about 1/5 liquid soap and then add water about an inch from the top so it has air. Now, it will foam.

Answer format: solution1/solution2
Answer: solution2