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