True Blue Clinging Bowl Cleaner removes scale, rust, algae and calcium deposits from bathtubs, wash basins and swimming pools. Use to keep fixtures sparkling with no scrubbing. Ready-to-use bathroom cleaner cleans urinals quickly and safely and is harmless to septic tanks when used as directed. It gives off no odors or fumes and does not penetrate porous surfaces. With powerful, acidic detergency, this bowl cleaner is ideal for cleaning toilets and urinals in office buildings, hotels, school and municipal institutions. It is ready to use, but you can also dilute it (1:2).