in khi there was a market called "botal gali" - in there one could buy all kinds of soaps in bulk, they even had petroleum jelly by the kg, I just asked for a non foaming soap, it looks like green colored water only but it is a powerful soap used in industrial cleaning.
If it was out of stock then chemical market in napier road would have it.
You sometimes need to explain them what you mean. In the past it was sold to the green bus terminus where they used it to clean the floors of the buses every night.