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WM Barr Klean Strip Acid Muriatic Green. Gallon. Klean-Strip Green safer muriatic acid has 90% lower fumes than standard muriatic acid and is safer to use and store. Etches concrete, brightens masonry and concrete, lowers pH in swimming pools and removes excess mortar from bricks. Klean-Strip Green solvents are effective high-quality products, but have a reduced impact on the world in which we live.