To remove hard water stains, mold, mildew, food stains, including tomato sauce: Apply InstaGone by spraying, brushing or rolling. Do not wipe off. Wait five to ten minutes before examining area. If stain is removed, rinse treated area thoroughly with wet cloth or sponge. Suggestion: Every month, add one packet of InstaGone to your empty washing machine or dishwasher and running one hot water wash cycle. This will prevent hard water stains and eliminate any odors.