Remove mold from upholstered furniture by first taking the piece outside to prevent the spores from spreading in the home. If possible, place the piece into direct sunlight as sunlight helps to kill the fungus. Brush or sweep any surface mold off of the piece, and then use a vacuum with brush attachment to suck up any remaining loose spores. Treat the fabric with equal parts rubbing alcohol or vinegar and water, and let it dry in the sun.
Another helpful solution for removing mold and mildew from upholstered furniture is a mixture of 2 teaspoons of tee tree oil and 2 cups of water. Spray the mixture on the portion of the fabric affected by mold, and allow it to dry. Grapefruit seed oil is another effective natural ingredient that helps battle mold when diluted in water. If neither of these methods kill the mold infestation, commercial fungicide sprays are available.
Prevent mold from coming back by limiting the upholstered piece's exposure to moisture. If the piece is in a damp or humid room such as a basement, consider using a dehumidifier to remove moisture from the air. Clean and dry any spills immediately before they can seep into the furniture's cushioning where mold is much more difficult to remove.