Wet the surface with water, then apply Lithofin MN Builder’s Clean and allow it to work for about one hour. Add some water, brush, and then remove the product. Rinse thoroughly with clear water. In case of stubborn staining repeat this process. Note: Some granites are pre-treated with products that may not be resistant to an acidic cleaner. Please test the product’s suitability prior to use. Discolorations resulting from plants look similar to rust and can be removed with Lithofin MN Outdoor Cleaner.