The substance with higher surface tension pulls more strongly than the one with lower surface tension, pulling the flow of liquid toward it. (sciencedaily.com)
New surfaces are also able to move low surface tension liquids other than oil. (sciencedaily.com)
Saponin is an all - natural surfactant which lowers the surface tension between your laundry and the wash water then bonding itself to the fibers of your laundry, literally lifting and removing stains, dirt, grease, and grime while simultaneously eliminating any odors and naturally softening your clothes. (clotheslines.com)