<human>:  How do I remove a red wine stain from a white cotton shirt?
<bot>: To remove a red wine stain from a white cotton shirt, you can first try to blot the stain with a cloth dipped in cold water. Then, you can make a mixture of 1 tablespoon of dishwashing liquid and 2 cups of cool water, and use it to gently scrub the stain in a circular motion. Finally, rinse the area with cold water and air dry it.