I think there should be enough proof in the following items to prove that this product did exist.
The advertisement photos are from a Melbourne newspaper called "THE ARGUS" and come from the 1920's.
From 1936, Maud Basham, better known as Aunt Daisy, hit the airwaves from Queen’s Arcade, Auckland, with a “Good morning, everybody.” For more than 30 years, this pocket battleship (she was only 1.5m tall) used her 200-words-a-minute firepower to cajole listeners, to enthuse and plug housewives’ helps once it became permissible to mention product names: “How lovely it is to be able to mention at last the thing I’ve been trying to tell you about for so long. It’s Clever Mary! That’s what I use for cleaning, it doesn’t hurt your hands, you see.”