Green Works, 24 OZ, Manuel Toilet Bowl Cleaner, With DfE & NPA Certification, Provides A Sparkling Clean Toilet Without Harsh Chemical Fumes, 99% Naturally Derived, Contains A Powerful Gel Formula That Cuts Right Through Rust, Hard Water Stains & Even Stubborn Mineral Deposits, Angled Spout Is Specially Designed To Target Hard To Reach Spots Under The Rim, Safe For Plumbing & Septic Systems.