The ISO 8502-6-2020 standard specifies a method of extraction of water-soluble contaminants for analysis, known as the Bresle method. This method is suitable for assessing the cleanliness of steel surfaces prior to application of painted or related products and can be used on surfaces of any shape and orientation. This standard was prepared by subcommittee SC 12 of the ISO/TC 35 paints and varnish technical committee and has superseded earlier versions to provide a more accurate and consistent test method. ISO 8502-6 focuses on specific extraction techniques using water as a solvent to ensure that coatings adhere uniformly to a clean surface prior to application.