Rustins decl4000 decking cleaner 4l rustins decl4000 p this 4l tub of decking cleaner from rustins is for cleaning and reviving weathered garden decking ideal for removing dirt grease and stains prior to treatment with rustins decking stain and seal or rustins decking oil can also be used to clean cladding fences window frames and any other exterior woodwork p rustins decl4000 decking cleaner 4 litre