Whats the difference between a pre-wash and a snow foam?
A pre-wash is basically used when the vehicle is particularly dirty with insect and bug splatter and other stubborn stains. It would normally be applied using either a trigger sprayer or some products can be applied using a snow foam lance. Pre-washes are still wax and coating safe but just offer a more aggressive clean when needed. A pre-wash would be used prior to the shampoo stage or even before snow foam as an additional clean before shampooing.
