A powerful acid-based cleaning solution designed to tackle tough stains on various surfaces. This cleaner effectively removes cement and mortar splashes, grime, oil, grease, and other stubborn marks from brickwork, patios, garages, paving, concrete floors, and warehouses. For best results, apply by brush, let it stand for 10-15 minutes without drying, scrub with a stiff brush, and rinse thoroughly with a hose. It can be used undiluted for very stubborn stains or diluted with 4 parts water for efflorescence removal. Caution: This product can affect limestone and marble.