War of the Soaps

Zed and Apple face all sorts of challenges and rely on K to decide between them. What the poor DIY apprentice is quite incapable of for fear of offending one. During an ordinary repair on Aqualaguna, Zed and Apple find themselves embroiled in a conflict between a bar of soap and a shower gel. Which of them washes the most efficiently? Zed and Apple each choose sides. K will have to manage the conflict...