Hard water tolerant. Contains no phosphates, caustics, acids or petroleum solvents. Contains no silicone wetting agents. Safe for clear coat finishes when used as directed. Stoner Car Care Pro FB1 Foaming Brush is concentrated for dilution with water only. When used directly from the container, start by diluting at 1:600 (FB1:water). To predilute, mix 1 part concentrate with 2 parts water and further dilute at 1:200. Test mixture and adjust dilution, if necessary, for desired foam and cleaning strength.