In a well-ventilated area, mix equal amounts of Calcium, Lime and Rust Remover and warm water. Test on a hidden area before applying to the entire surface. Apply directly to the stain with a brush, cloth or sponge. After 2 minutes rinse promptly with cold water. Never leave Calcium, Lime and Rust Remover on an area for longer than two minutes. If the stain does not disappear, repeat this process and add more Calcium, Lime and Rust Remover solution as necessary. Never mix Calcium, Lime and Rust Remover with other household cleaners or bleach. Always read the manufacturer's directions of the item you will be cleaning to make sure that this product is compatible. Consumer discretion is always advised.