Most powerwashing wholesalers carry a good soap,it will always cost alittle more.If it was me I think I would use a caustic and a alkaline soap mixed together .If I had to choose one over the other I'd pick the alkaline soaps.

2-stepping does a great job in cleaning and usually no brushing is needed but I would not use this on cars or pickups unless you really know what your doing.Cars and pickups have different paint jobs as to the big rigs I wash which can stand up under weekly 2-stepping.

When In Doubt Think It Out