When I see an ad, I sometimes like to track the firm in the Toronto city directories to see how long they remained in business. For example, here’s an ad from the March 31 1931 Toronto Daily Star:
The Toronto Wet Wash Laundry originally opened for business sometime between 1910 and 1915 at what was then 291 Arthur Street. Its proprietor was W. John Henning. By 1920, this address was 1125 Dundas West.
By 1925, the laundry had moved to 175 Ossington Avenue (just around the corner from their old location). By 1935, the company had renamed itself Toronto Launderers and Dry Cleaners Limited, having branched out into dry cleaning. Mr. Henning was still in charge, with his wife listed as vice-president. By 1945, their son, W. John Henning Jr., was treasurer.
The company remained in business through at least 1969, but it looks like the family had sold it long before – the 1955 city directory shows W. John Henning (presumably Junior) as the operator of Henning’s Garage. The 175 Ossington Avenue location is now townhouses.