Remove as much of the stain as you can by dabbing the stain with a dry white paper towel or pick it up with a spoon.
neutralize the stain with a 1 tablespoon of clear household ammonia to 1/2 cup of water mix. Saturate the spot with the mix using a spray bottle. Be sure not to wet the backing of the carpet. Blot with a white paper towel to remove excess moisture.
If the stain is still persistent, mix 1/4 teaspoon of a clear hand or dish washing detergent (which does not contain bleach or lanolin) with 1 quart of water. Use a dabbing motion to work the detergent into the stain. If spot is being removed continue applying detergent solution and blotting with a white paper towel until spot is removed.
Using a spray bottle, rinse with water and blot the area to remove excess moisture.
Spray lightly with water, do not blot this time; apply pad of paper towels and brick and allow to dry.
If stain still remains, mix 1 cup of white vinegar with 2 cups of water. Apply the solution, rinse, and blot dry