Car shampoo for jet wash lances? in Cleaning Posted June 13, 2018 Yup, as Andy says, you are wasting your time with a snow foam lance if you're looking for a quick wash solution. Snow foaming a car increases washing time but makes it a lot less likely that you'll scratch it. I jet wash, snow foam, jet wash off, wash with the 2 bucket method, dry....and then wax every couple of weeks to keep the layers topped up. It ain't quick. However, I only snow foam if the car is particularly dirty.