How to Remove Dry Red Wine Stains from Cotton
To remove dry red wine stains from cotton, start by mixing equal parts hydrogen peroxide and liquid dish soap. Then, rub the mixture into the stain using your fingers so it's completely covered. Let the mixture sit on the stain for 30 minutes and then rinse it off with warm water. Finally, soak the fabric in hot water for 1 hour before hanging it up to air dry.
Mix equal parts hydrogen peroxide and liquid dish soap. Neither of the ingredients work well on their own, but together, they are the most widely-touted method for removing dried red wine stains. The dish soap should be a non-bleach, non-alkali detergent product – although it's okay to use a bleach-based product if your cotton is white. Bleach might help you remove the stain, but it might also remove any other colors from the fabric! For a slightly stronger mixture, use one part dish detergent and two parts hydrogen peroxide. Rub the mixture into the stain. First, pour a small amount of the soap-and-peroxide solution onto the stain. Use your fingers to massage the mix into the stained area. Work inward, from the outside of the stain towards the center; this should keep the stain from spreading. Before you apply the soap-and-peroxide mixture, place a towel inside of the garment to keep the stain from transferring to the other side. This way, the towel will absorb the stain. If you don't want to massage the stain with your hands, or if the fabric is particularly delicate: you can blot the stain instead. Pour the soap-and-peroxide solution onto a clean towel, then firmly dab the stain with the towel. Let the soap and peroxide sink into the fabric for 30 minutes. Make sure that the stain is thoroughly saturated with the mixture. Leave the cotton to sit for at least 30 minutes before you try to wash out the soap. Rinse the fabric with warm water. Fill a bowl with warm water, then let the cotton soak. Make sure that the material is thoroughly saturated with water. Try running the stain under a warm faucet. Soak the stain in hot water. Transfer the fabric to hot water, then let soak for an hour. A washing machine with a soak cycle is perfect for this. Don't add any laundry soap! The fabric should still have some soap-and-peroxide mix in it. Rinse the fabric in  cold water. Once the cotton has soaked in the hot-to-warm water for one hour, give it a cold rinse. Don't add any laundry soap. If you don't want to rinse by hand, you can run a washing machine on a cold cycle. Hang dry. Don't use a drying machine, especially if the fabric is 100% cotton! High heat can dramatically shrink wet cotton. If the red wine stain remains, feel free to repeat the process. Soak the cotton in cold water. This step will moisten the dry stain so that it's more likely to come out. You don't need to take long – just enough to thoroughly wet the fabric. Wring out the excess water. The cotton should be damp, but not dripping. Be gentle, and try not to stretch or tear the material. Apply lemon juice to the stain. Squeeze the juice directly from a lemon, or use a pre-bottled lemon juice product. Soak the stain thoroughly, so that the acidity begins to act upon the wine. Scrub the stain with table salt. As the lemon soaks into the fabric, shake salt onto the area. Use your fingers to massage the salt and lemon into the stain. Work the salt in from the front and the back of the stained area for more dramatic effect. Standard table salt is fine, but any salt will do. You may even be able to use coarse sand and other gritty materials to scrub the stain. Rinse and wring out the fabric. Rinse the back of the stain in cold water from a faucet. Wring the fabric out with your hands, and massage it, paying special attention to the stained area. Do not stretch or tear the material, but don't be afraid to vigorously rub the stain. When the stain is nearly gone, wrap the garment in a clean towel to wring out most of the moisture. Always rinse from the back side of a stain. Wash it out of the fabric, not through it! Add more lemon juice. Squeeze more lemon juice directly onto the stain, in a concentrated dose. Lay the cotton out in the sun. Use a flat surface, if possible, so that the fabric does not stretch as it dries. The acidic lemon and the UV rays of the sun make for a natural, fabric-safe improvised bleach. Try rubbing white wine into the fabric. If your clothing is white, you can rub white wine over it. When you want to get rid of the smell, simply hand-wash the cotton. Use cream of tartar and water. Mix a paste of equal increments tartar cream and water. Rub the paste into the fabric as you would any other treatment. This mixture should help moisten the fabric and gradually bleach the stain away. Use a solvent and bar soap. First, soak the fabric in water to help maintain a soft texture for the affected spot. Next, apply any solvent material (such as kerosene) to the stained area. Let the solvent soak in. Then, wash the stain with a standard bar soap. Rub the stain with bar soap until it is gone. The solvent should ease removal without damaging the material. If you apply detergent immediately, it can harm the material due to its harsh chemical composition. Use commercial fabric cleaners. If your cotton is white, you can use bleach. Otherwise, look for cleaning products that do not harm the material. 
Mix equal parts hydrogen peroxide and liquid dish soap. Rub the mixture into the stain. Let the soap and peroxide sink into the fabric for 30 minutes. Rinse the fabric with warm water. Soak the stain in hot water. Rinse the fabric in  cold water. Hang dry. Soak the cotton in cold water. Wring out the excess water. Apply lemon juice to the stain. Scrub the stain with table salt. Rinse and wring out the fabric. Add more lemon juice. Try rubbing white wine into the fabric. Use cream of tartar and water. Use a solvent and bar soap. Use commercial fabric cleaners. 