Surface active agent (surfactant) is a substance or a blend of substances that lower the surface tension or interfacial tension between two liquids. It contains both hydrophobic groups (its tail) and hydrophilic groups (its head). Surfactants lower the surface tension of a liquid by spreading spontaneously over its surface. https://safeersappliancers.shop/product-category/zanussi-zwi71401wa-7kg-1400-rpm-built-in-washing-machine/