Mr McKenic® - Stain Buster can be used for a wide range of applications to remove stains, such as: Mould & Mildew Stains - In environments with long exposure to moisture, typically in bathrooms. Copper Oxide Stain - Corrosion of copper pipes found in HVAC systems and water supply lines. Toilet Bowl Stain - Found on toilet bowls and urinals. Pour directly into urinals to prevent chokage. Cement & Lime Deposits - Residues from concrete mixers, bricks, ceramic tiles and all mansonry work. Rust Stain - Red iron oxides produced when ferrous metals corrode. Scale Deposit - Formed at surfaces in constant contact with water such as pipes and heaters. Directions for use: Mr McKenic®- Stain Buster can be applied using brush or soak methods. Apply the product onto target areas and leave it for 5-8 minutes to work. Agitate with a brush or a soft pad for stubborn stains. Rinse off thoroughly with plenty of water. Repeat application when necessary. This product can be diluted up to 6 parts of water, depending on the stains. Product Code: CR3880