Pour 1/2 cup into the rinse cycle. Soften Clothes: Use 1/2 cup in the fabric softener compartment to break down detergent buildup. Brighten Whites: Add 1 1/2 cups to the wash cycle or soak whites overnight in hot water and vinegar. No need to worry about the smell — it disappears as clothes dry. Ready to give it a try? Which tip will you use on your next laundry day?