Wisk making little froth
How ironic because the American version (from Lever Bros.) was known to create tons of froth and not being easily rinsed from fabrics. Something that hasn't changed until rather recently if at all.
Recall purchasing several bottles of Wisk a few years ago because they were on sale and liked the scent. Despite the "HE" designation the stuff frothed up my Miele terribly, and was that hard to rinse away. All unopened bottles were returned....
Wisk liquid detergent's claim to fame was unlike powders which then relied upon alkaline builders such as washing soda, phosphates and borax along with surfactants, the thing was mostly anionic surfactant.
While highly sudsing anionic surfactants are good at removing grease, oil, fats, and other such soils from fabrics. The famous "ring around the collar" (aka "City Dirt" which gave housewives and laundries so much worry is caused by sebum (skin oils) combined with dirt and sweat. The common way to treat such soils was to rub with a bar of soap like Fairy, Fels or whatever. Well anionic surfactants are the man made version of soaps. They have similar properties but anionic surfactants aren't affected to a certain extent by hard water like soap.