This Gerni 1L Outdoor Surface Wash is great for cleaning and revitalising timber decking, weatherboard, patios, pathways and pergolas. The biodegradable formulation removes oils, dirt, grime and contaminants, leaving a fresh clean surface ready for coating. Suitable for use with all Gerni high pressure washers and accessories, place the concentrate directly in soap reservoirs or foam sprayers for quick and easy application, or dilute this in a bucket for manual application with a sponge.