BSI BS EN ISO 20566 "Paints and varnish - Determination of scratch resistance of coating systems using a laboratory-scale car wash method" specifies an experimental method for testing the scratch resistance of coating systems by simulating the car wash process. This method simulates the abrasion of body coatings during car wash and cleaning in actual use using laboratory-scale car wash equipment. The test results can be used to evaluate the scratch resistance and durability of coatings in daily use, helping manufacturers optimize coating formulations and improve product damage resistance. This standard is widely used in the quality control and performance testing of automotive coatings to ensure that the coating can effectively cope with physical abrasion in daily use and maintain its Appearance and function.