Pull Heavy-Duty Toilet Bowl Cleaner was carefully formulated with added detergents to ensure it will work quickly and remove even the most stubborn rust, scale and mineral deposits when used as directed. Made with 23 percent hydrochloric acid and excellent detergency, it is ideal for hard water areas. Milky white emulsion cleans and descales in one easy step. The ready-to-use cleaner is easy to apply with pour spout. After flushing, simply open 45 degrees and squeeze the bottle to coat surfaces under the bowl rim. Let stand 10 minutes before scrubbing and then flush to rinse.