Prepare yourself: Your cloth napkins will take quite a beating during a formal holiday meal, and some of the most stain-prone smears may be caused by that vibrant, tangy culprit, cranberry sauce. Flush this stain with cool water as soon as dinner is over and your guests have gone. Then, mix a little laundry detergent and one tablespoon of white vinegar into a quart of cool water, and soak the stain in the solution for 15 to 30 minutes. Rinse it off to see your results. If the stain remains, gently sponge rubbing alcohol over the stain and rinse again thoroughly.