My mom uses one of those cheapie cleaners from the Dollar Store like Amma suggested. Mom swears by it for her T-shirts.
Here are a couple ideas I found on the net. I don't know if they will do anything for you or not, but at this point I guess you have nothing to loose.
Stretch the stained area over a bowl and secure with a rubber band.
Pour boiling water through the stain from a height of 2 to 3 feet. Stand back to avoid splatters.
Although cotton and linen can stand boiling water, some of the finishes and colors used on the fabrics might be damaged by such harsh treatment.
Be sure to test on an inconspicuous corner first.
Vinegar
You can lift out many water-soluble stains-including beer, orange and other fruit juices, black coffee or tea, and vomit-from your cotton-blend clothing by patting the spot with a cloth or towel moistened with undiluted white vinegar just before placing it in the wash. For large stains, you may want to soak the garment overnight in a solution of 3 parts vinegar to 1 part cold water before washing.