Mix 1 tablespoon of dish-washing liquid, 1 tablespoon of white vinegar, and 2 cups of warm water.
Dip a clean, white cloth in the solution, and wring it to remove excess water. Dab the damp cloth on the stain, and then blot the spot with a dry cloth. Repeat until the stain is gone.
If the stain remains, dip another cloth in rubbing alcohol. Alternately dab the alcohol-soaked cloth and dry cloth on the stain.
If the stain still won't go away, make another cleaning mixture. Mix 1 teaspoon of dish-washing liquid, 1 tablespoon of ammonia, and 2 cups of warm water. Use a cloth to apply this solution to the stain. Blot the stain with a dry cloth, and reapply the solution as needed.
Use a cloth to apply clean water to the stain, and blot it dry.