A biodegradable, mineral acid free cleaner that removes cement-based grout haze and deep cleans heavily soiled cement-based grouts. Through the use of advanced acid-mimic technology, this product works like an acid-based cleaner but is safer for the user, environment and colored grouts. Use undiluted for heavy-duty cleaning or dilute one quart with water and make over 2 gallons of cleaning solution. Designed for use with ceramic, porcelain, glass tile and cement-based grouts.