J.I.
Mix 3 parts warm water, vinegar and blue dawn dish detergent into a spray bottle. Spray the stain and let it sit for about 5 minutes. Get a dry white towel (or a few) and heat up your iron. Make sure to put in water and set to steam. When the iron is nice and hot, place the white towel on top of the stain and iron away. The stain will come off of the carpet and onto the towel. Then you can just bleach the towel to get clean.
This worked on red gatorade for me and I now use it all over the house. Good luck!