Please choose the correct solution to the question: How to easily clean white sneakers?

Solution1: Rub a mixture of corn starch and water under the shoes, before dried rub away at it with a toothbrush and then rinse in water and soap

Solution2: Rub a mixture of corn starch and water on the shoes, once dried rub away at it with a toothbrush and then rinse in water and soap

Answer format: solution1/solution2