Step: Pressure rinse the undercarriage and wheel wells (Most important step)
Switch to the Main wash or Rinse with clean water program.
Kneel down or bend towards the car and aim the gun nozzle inside the fenders (around the wheels) and under the chassis. Spray water from underneath the car at an angle to flush out salt from all crevices, axle arms, and brake calipers.
Then thoroughly rinse the entire car from top to bottom to wash away all loosened foam and melted salt from the body.
