http://www.ebay.com/itm/Vintage-Soil...-/121662694887
If this experiment worked, there'll be a regrettably small image of the Soil-Off one-quart can above. However, it can be enlarged when viewed on Ebay.
For anyone who might be interested in vintage packaging like this (or vintage products and/or companies), I found a few more details. The company name, "Soil-Off Manufacturing Co.", pretty much indicates that its namesake product likely was its only one. Ditto the slogan on the back of the can, "Perfected and Established 1932". So the inventor likely was the business owner.
The company filed a trademark application on August 7, 1947; it expired on November 3, 1992. Google Books turned up a mention in a display ad in the
San Jose Evening News of September 4, 1944: 60 cents for the one-quart can pictured, $1.00 for the half-gallon glass jar. There's a photo on-line of the half-gallon jar with updated artwork (from the mid/late-1950s, I'd guess):
http://mrsguy.blogspot.com/2013/10/the-days-haul.html
So the company apparently lasted at least that long. A search of the CA Secretary of State's database didn't find a corporate match, but it might not have records from that far back. Ecolab, Inc. sells an industrial strength (literally) cleaner named Soil-Off II, but I don't know if there's a relationship to the original product.