I use Iron-X snow soap, but only as a maintence wash after a full Decon has been done with regular Iron-X. The snow soap is less powerful the regular Iron-X so it can clean up minor deposit build up, but isn't really made to do full decon IMO.
It is also a fairly good cleaning soap as well. It actually works well as your Decon prewash and gets you ready for Iron-X and clay. I have watched it clean paint with sealants and waxes to a water holding squeaky clean surface in one wash. But that was at a strong dilution.