The main goal of snow foam car soap is to soften hardened dirt, road grime, tree sap, or insects so that they can easily be removed without causing any scratches or swirls.
Snow foam can be used as a pre-washing method or as a preparation for hand washing. The mix of detergent, water, and compressed air creates a thick lather that covers the vehicle and looks a bit like a blanket of snow.
The most common method of snow foaming is using a snow foam lance bottle which is connected to a pressure washer gun or wand. Snow foam car wash kits oftentimes come with the bottle and car wash shampoo. They also include attachments such as various nozzle tips or some extras including microfiber cleaning gloves, towels, and wool wash pads.
Remember it is best to apply snow foam to a dry cool surface away from direct sunlight so that the detergent does not dry up prematurely. You can leave it on for up to five minutes and then pressure rinse your vehicle.