Please choose the correct solution to the question: How to remove a set in (washed and dried) oil stain on clothes.

Solution1: First put a piece of cardboard behind material with stain, then spray stain with WD-40, poor a lot of dry flour over stain and scrub scrub scrub and repeat process (less WD-40) again and again, then pre-treat with dawn soap then machine wash.

Solution2: First put a piece of cardboard behind material with stain, then spray stain with WD-40, poor a lot of baking soda over stain and scrub scrub scrub and repeat process (less WD-40) again and again, then pre-treat with dawn soap then machine wash.

Answer format: solution1/solution2
Answer: solution2