<human>:  How do I remove a stubborn grape stain from my shirt?
<bot>: One way to remove a stubborn grape stain from a shirt is to mix equal parts white distilled vinegar and liquid laundry detergent, then gently scrub the stained area with a soft brush or cloth. After scrubbing, rinse the area with cold water and continue to rinse until the stain is no longer visible. You can also try soaking the stained area in cold water for several hours before repeating the scrubbing method.