I just went out and checked to see what brand my wax is, and the pail was re-badged by my local distributor. He carries KO brand soaps, so I wouldn't be surprised if that's what it is.
It is a car wash wax, cherry scented, and is also advertised as a detergent-wax. I don't know about that, but I mix about 4 oz to a 5 gallon pail, with my house wash mix, and xjet on the buildings that I wash.
It is a sheeting type wax, and makes the water just sheet right off everything. I don't think it lasts long, but the customer likes how it looks, and besides, the cherry smell helps cover up the chlorine smell. At about $45 per 5 gallon pail, I don't consider it a big expense.
Regarding soft water........if you have really hard water, or maybe well water, then a softener probably is a good thing. But if your local water is of reasonable hardness, I don't think it's necessary, unless you're looking for a spot-free rinse, like doing cars in a dealership.