Why need Pre-Wash with the foam lance ?

Why need Pre-Wash with the foam lance ?
Dirt caught in wash mitts is the leading cause of scratches and swirls in paintwork – eliminating as much of the dirt and grit as possible before a mitt comes into contact with paintwork during the main wash is the best way to avoid this issue.
During your winter car care, use a snow foam pre-cleaner applied through a foam lance attached to a pressure washer if you have one, or alternatively through a pump-up spray foamer. Either way, allow it to dwell on the surface for a few minutes before rinsing off – how long will depend on the ambient air temperature – do not allow the product to freeze.
The thick foam sits on the car, encapsulates larger particles of dirt and lifts them away from the surface allowing them to be safely rinsed off with contact.
 
 

Car Wash Tools Tornador New System Clean Gun.....

Car Wash Tools Tornador New System Clean Gun.....