Decking Cleaner - 15kg4kg of Decking Cleaner is ideal for cleaning green infestations, dirt, grime, bird droppings & more from medium large areas of wooden decking, including cedar, redwood & composite decking. Mix 1 2 scoops with a litre of hot water and pour or brush on to your decking. Scrub with a stiff brush and allow a few minutes to act. Rinse off or use a power hose to clear any residue and your decking will look as good as new!