Blueberries are delicious to eat but their rich juices can leave a reminder behind in the form of a difficult to remove stain. Blueberries leave a dye-like stain. Dye stains, like felt-tip marker and mustard, are the hardest of all stains to remove, according to the Ohio State University College of Food, Agricultural and Environmental Science. Treat a blueberry stain with soaking, detergent and fast action.
Dab the blueberry stain with cold water to saturate. The longer a blueberry stain sets, the more stubborn the stain will become.
Mix 1 tablespoon of white vinegar, 1/2 teaspoon of liquid laundry detergent and 1 quart of cool water. Soak the stain for 15 minutes. Rinse with cold water.
Dilute all-fabric powered bleach in water and soak the stained area if the stain remains. Rinse with cold water.
Dilute liquid chlorine bleach in cold water and soak white or color-fast garments as a last resort. Since bleach can discolor fabric, it will be less noticeable to treat the whole garment rather than one spot. If the stain remains after 15 minutes, it cannot be removed and further treatment will weaken the fabric.