High detergent, mildly alkaline, emulsifying, non-etch soak cleaner for aluminum. Since Dynaprep S201 does not contain silicates, no residual siliceous films remain to cause a non-uniform appearance after electroless nickel plating.  Dynaprep S201 contains no EDTA, providing a waste treatment friendly product. At recommended concentration, and temperature Dynaprep S201 will not etch aluminum.