Have now tested this for a really rapid delivery of tretti.se. It gave the same results as chemical products made on my shower wall of glass. Absolutely not happy here but may depend on heavily ingrained dirt / lime longer. This wash languished certainly not with this and the stains are still there. Clinker joints however, was no match, they were clean except any dirt that he broke down in the joints. It can not do something about besides tapping away and add new joint. A yoke wash, the question is whether this differs suction from the cheaper models?
Takes a while for it to boil the water. Otherwise nothing to complain about.