This Bond It Brick and Patio cleaner will remove cement and mortar splashes, grime, oil, grease and other difficult-to-remove stains, from brickwork, patios, garages, paving, concrete floors and warehouses. APPLICATION Apply by brush and allow to stand for 10-15 minutes – do not allow to dry out. Scrub with a stiff brush then rinse thoroughly using a hose pipe. Can be used undiluted for stubborn stains. To remove efflorescence dilute 4 parts water, brush on and rinse off. Note: this product will attack limestone and marble.