Don’t have lemon juice? Baking soda and white vinegar are both natural whiteners (and softeners!) that can be used when washing your sheets. According to Style At Home, you can add half a cup of baking soda with your detergent at the beginning of the wash cycle. Then, just before the rinse cycle begins, pour half a cup of white vinegar into your washer. And, yes, the vinegar odor will rinse out.