A carpet cleaning composition including a fungicide to prevent the growth of fungi on a carpeted surface during an extraction process, particularly during a dry-down period after extraction process wherein residual carpet cleaning solution remains on the carpeted surface. The fungicide is active while the composition is in the liquid state and becomes inactive and friable when the composition is dry. The fungicide bonds to a film that is formed on the carpet fibers to prevent fungi growth on the film. A method of extraction carpet cleaning comprises the steps of depositing the carpet cleaning composition on the carpet, extracting a portion of the cleaning composition with suction leaving on at least some of the carpet fibers an aqueous film that includes the fungicide, and drying the film.