Use with SpongeBath. Our powerful Concentrated Cleaning Solution Kills 99.99% of Odor-Causing Bacteria in Sponges. Cleans & Removes: Dirt & Odors, Grease & Grime, Soap Scum, Rust & Mold Stains, and is designed specifically to work with SpongeBath to clean deep into the micro-crevices of a sponge. Our safe and effective formula is derived from all natural and eco-friendly ingredients.