Re: The devils foam
No, carbolic is different.
Green soap as used in the Netherlands and Germany was traditionally made from hemp oil, nowadays usually some other cheap oil like rapeseed or soybean oil and saponified with potassium hydroxide instead of the usual sodium hydroxide, which means it's a very soft almost gel like soap.
It's also very useful because it's very universally applicable and a lot cheaper (and often better) than a lot of the dedicated cleaning products.