And Another Thing
Chipso's claim to fame was it's mildness when compared to other soaps such as Fels, Octagon and others.
This gentleness supposedly came from (at least according to P&G), Chipso was a "lye free" or at least had much less of the stuff than other laundry soaps of the time. Hence it also being gentle on hands (all those references in adverts to wash day red hands), regardless if madame was washing laundry,dishes or the floors.
Because of it's near pH neutral properties, Chipso was also good for woolens, silks and wouldn't fade colours. Again this is all per P&G's ads, but there is some truth to it, after all Ivory, Lux and other mild soaps were sold during the same period for laundering woolens, silks, danties and other fine laundry.
Soap chips were preferred by commercial laundries, washer women, etc because if thin enough/made properly they dissloved almost instantly in hot or warm water. Soap powders at that time had a tendency to form balls, especially when used in industrial washing machines of the era.
As the above advert states, women and anyone else had been making soap "chips" by shaving off bits of soap with a knife or carpenter's plane for ages. P&G saved housewives from this labour and perhaps injury by purchasing pre-flaked product.
Have seen vintage sacks of soap chips though not sure if they were Chipso, and they were probably sold to commercial laundries.