Passage: The water engine was also successfully used in washing machines, e. g. from 1914 by the firm of Miele. These washing machines, which were very common especially in rural areas until the 1960s, comprised a wooden tub with a rotating cross built into the cover. This 'star handle' was rotated in regular, to and fro, movements by two pistons which were connected to the water mains. The washing effect was achieved by the constant movement of the washing in the washtub filled with soap suds (Lauge) and/or water.

Question: Lauge was added to which pieces of machinery?
washing machines