Remove as much material as you can using a spoon or a paper towel. Make a solution of one tablespoon dish soap and 2 cups warm water. Gently sponge the solution onto the stained area, then begin blotting with a clean dry towel. Always work from the outside of the stain, and move inward. This will prevent stain from spreading.
If the stain remains after several tries with the soap solution, make a solution of 1 tablespoon of ammonia and 2 cups of cold water, and repeat the process above. Rinse with cool water and blot completely dry.