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Mix 1 tablespoon of liquid dish washing detergent with 2 cups of cold water in a large bowl to make a detergent solution. Soak a clean, white cloth with your dish detergent/cold water solution and apply it to the affected area. A normal sized scrub brush might cause you to scrub too vigorously, pushing the stain deeper into the fabric. Using a toothbrush will keep you from brushing too hard, which might cause the stain to spread or permanently set into your upholstery. With a clean, wet cloth, rinse the solution using dabbing motions. For stubborn stains, re-apply your solution and scrub it again with your toothbrush. When you have finished scrubbing, you should rinse the area again with a clean, wet cloth. This time, using a cloth wet with cold water, rinse the remaining solution out of your upholstery. Rinse thoroughly with dabbing motions. Use a cloth towel to dry the area, pull out the excess moisture by blotting the towel to it until most of the moisture is removed.

Summary:
Create a solution with dish washing detergent and cold water. Apply your solution to the stained area. Brush the stained area gently. Blot the area. Make a final rinse. Dry the area.