Lemons can help whiten. White damask napkins, linens, and even socks can be whitened on the stove: Fill a pot with water and a few slices of fresh lemon; bring the water to a boil. Turn off heat, add linens, and let soak for up to an hour; launder as usual. For extra brightening, spread them out in the sunlight to dry.    Read more at Marthastewart.com: Home Repairs – Martha Stewart
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