Objective: how do I clean old plastic?

Which of the following solutions is more sound in terms of naive physics reasoning?

Choose from:
(1). You can clean plastic using a paste made out of 3 parts baking soda and 1 part water. Just scrub the paste into the plastic using a cloth or an old toothbrush and then rinse it off with a mixture of baking powder water For tough stains on plastic, soak the plastic in diluted bleach for 5-10 minutes. Then, scrub it with a sponge and rinse;
(2). You can clean plastic using a paste made out of 3 parts baking soda and 1 part water. Just scrub the paste into the plastic using a cloth or an old toothbrush and then rinse it off. For tough stains on plastic, soak the plastic in diluted bleach for 5-10 minutes. Then, scrub it with a sponge and rinse;
(2).