The Eucerin ‘Anti-Stain After Wash’ technology helps to reduce the intensity of sunscreen stains after washing.The yellow stains that appear on clothes, especially cottons, after using sunscreen products are caused by UV light filters. The washing process can make these stains worse rather than remove them: the iron and copper ions in water, when combined with very hot water and bleaching agents, can actually bind-in and intensify the stains. Eucerin’s ‘Anti-Stain After Wash’ technology works in two ways. Firstly, it contains an anti-redeposition agent that prevents so much of the filter from binding with the fabric in the first place. Secondly, it contains a complexing agent that binds with the ions in water so they are less able to intensify stains when fabrics are washed.