Madison Chemical (Madison, IN) ProClean FOAMING ACID is a high foaming, concentrated blend of acids and surfactants which penetrates and removes scale, rust, hard water and mineral salts, and more from industrial plants. Ideal for items like heat exchangers, cooling towers, chillers, boilers and water lines, it can be applied by manual, foam or immersion methods. When used in a “foam generator” it produces thick, stable, wet foam necessary for cleaning while reducing dry-out or run-off. It cleans all ferrous and stainless surfaces, particularly vertical and overhead surfaces, and those not easily cleaned by other methods. ProClean FOAMING ACID rinses easily with potable water and without streaking.