Spray Star brite Rust Stain Remover directly onto the surface to be treated. Leave the product until the stain has disappeared before rinsing with fresh water. Deep stains may require a second application and light scrubbing with a brush or rag. To prevent future rust stains, apply a protective coating of Star brite Gloss to the area that has been cleaned to seal the surface pores. Avoid contact with fabrics. Before general cleaning, do a colour fastness test on an inconspicuous area to be cleaned.