Stonecare4U's Deck Cleaner is a high-performance cleaner specially formulated for cleaning areas of wooden decking. It is also suitable for cleaning other outdoor hard surfaces including artificial decking and garden furniture. Simply apply and leave for 2 hours and then wash off. It will quickly remove layers of dirt and grime as well as green algae, lichen and black spots, even if the decking has been left unmaintained for long periods. Stonecare4U's Deck Cleaner contains a chlorine type agent as an active ingredient and will stain fabrics and sensitive materials. Take special care to avoid contact with fabrics & tarmac during application. The fluid might cause slight lightening of some surfaces – always try product on-site in an inconspicuous area prior to use.