(4) 1 gallon containers. This concentrated, fast-acting, liquid carpet hot water extraction and bonnet cleaner works by penetrating and emulsifying grease, oil, dirt and grime in carpet fibers so that they may be easily picked up by the vacuum wand. This pH buffered, controlled foaming formula contains optical brighteners to revive and enhance original colors, as well as polymeric soil retardants to coat carpet fibers and prevent future soil penetration and absorption. Contains corrosion inhibitors and water softening agents. Very effective when used as a bonnet shampoo.