16 OZ, Toilet Bowl Cleaner, Deep Cleans To Remove Rust & Mineral Stains, Cleans & Deodorizes, Thick Formula Clings To Bowl To Provide Deep Cleaning As It Deodorizes, Angle-Neck Bottle Gets Under Rim, Safe For White & Colored Bowls, Safe For Plumbing & Septic System, Easy To Use, Flush Toilet, Apply Liberally To All Surfaces Of Interior Bowl & Under Rim, Let Stand 10 Minutes, Brush Bowl & Flush.