Blueberries may taste great in a breakfast muffin, but those bright purplish stains are murder on light fabrics. The same goes for grape juice and cranberry juice. If you don't want to go through life looking like a fruit salad, treat berry stains with equal parts dishwashing liquid and white vinegar. Rub the mixture on, and leave it in place for 15 minutes or so. Rinse it off with warm water, and launder the garment as you would normally. You can repeat the process as needed. If you're working with a white tablecloth, fabric bleach is a good option, too.