This is a question with answer options. Goal: How to remove set-in laundry stains.

Which of the following methods is more reasonable for accomplishing this goal?

Choices:
a). Saturate set-in stains with vinegar, then rub the spot with a paste made from equal parts vinegar and baking soda. You can add a couple tablespoons each of vinegar and laundry detergent to a bucket of water and soak the garment overnight if the stain persists. Rinse and wash.;
b). Saturate set-in stains with vinegar, then rub the spot with a paste made from equal parts vinegar and baking soda. You can add a couple tablespoons each of vinegar and laundry detergent to a bucket of water and soak the garment overnight if the stain persists. No rinsing required.;...I think the answer is
a).