The Zep Commercial Driveway, Concrete & Masonry Cleaner Concentrate is a concentrated solution designed to provide fast and powerful cleaning of driveways, slabs, quarry tiles, asphalt, brick, patios and concrete surfaces. It helps to rejuvenate outdoor floors by working hard on tough stains to remove oil and grease, quickly and easily. This product can be used with pressure washers or applied neat to the surface. One five-litre bottle can make up to 100 litres of cleaning solution, says Zep.