CHEMTECH 5 LITRE CT20 WASH N WAX CONCENTRATE MAKES UP TO 500 LITRESGENTLY CLEANS, SHINES & PROTECTS. SAFE ON ALL VEHICLE SURFACES. Chemtech CT20 Wash n Wax is a concentrated gel that has been specially formulated to gently break through the toughest road grime whilst leaving a sparkling clean and longer lasting protective sheen on all vehicles.CT20 is safe to use on any painted surface including clear-coated and modern metallic finishes on all types of vehicles, 4WD s, motorbikes, caravans, buses and boats. CT20 is pH neutral and biodegradable.CT20 contains a special blend of cleaning agents that inhibits rust and corrosion and contains wax to leave a longer lasting protective film and sheen.