Coffee stains leave a brown, and sometimes sticky, reminder on your carpet that someone has had a coffee accident. It's best to tend to coffee stains immediately but that's not always possible. Old, dried coffee stains can permanently alter the appearance of your carpeting and leave a coffee odor, but this need not happen. Removing dried coffee stains from carpeting is simple, using supplies found in your home. Natural cleaning methods are effective and save you the money you'd spend on commercial stain removal products.
Mix 1 tbsp. mild dish detergent, 1 tbsp. white vinegar and 2 cups of warm water in a bowl. Stir the solution well with a spoon.
Apply the detergent and vinegar solution to the dry coffee stain using a clean cloth. Blot from the outside of the stain toward the middle, refreshing the solution on the cloth, as needed. Alternate by blotting with a dry cloth to pick up the old coffee stain as it loosens.
Combine 1 capful of enzyme laundry detergent with 1 cup of warm water in your bowl. Dab this solution on the old coffee stain if the coffee contained sugar and cream. The enzymes in the detergent will help break down and loosen the sugar and cream's stickiness.
Rinse the area of the carpet where the dried coffee stain was with cool water. Blot up the water from the carpet and allow the carpet to air dry.