The two step system was popularized by a major equipment manufacturer and field-tested for many years. The first step is a hydrofluoric acid product that sets the magnetic attraction of the soil. The second step is an alkaline chemical that reverses the attraction and repels the soil from the surface. Step 2 contains Potassium Hydroxide and will have a hazmat fee. Many people in the industry are strong believers in two step washing. 1 drum of either makes 4. Meter then at 1:25.