Window soap Swan For washing windows and glass areas. Properties: Gives a nice and shiny surface without streaks. Dosage: approx. 0.5 dl. to 10 liters of water. Content: 15% or more, but less than 30%. Anionic surfactants. pH value: Approx. 6.5 pH in concentrated form. Approx. 7.0 pH in 0.5% solution. Nordic Ecolabel approval: 526 123