SAFE to CLEAN is a multi-Purpose Probiotic Cleaner. The long-lasting cleaning action can be used on ANY outdoor surface such as Patio Flags; Decking; Conservatories (Glass or Plastic); Roofs (Felt or Slate); Outside Walls - both painted and unpainted. Other home & garden areas include Tarmacadam Driveways; Wood & Concrete Fencing; Stone Wall; Garden Sheds; Greenhouses; Statues; Plant Pots; Pebble; Garden Furniture; Canopies & Fabrics; Artificial Grass. 1.5 Litre Super Concentrate - makes 30 litres when diluted with water.