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The snowfoam lance is an attachment for a pressure washer that pushes water and a soap micture through a nozzle with a very fine filter in it. This makes the soap mixture foam as soon as it leaves the nozzle. The foam is sprayed over the surface you want to clean. In turn, the foam will soak the dirt, making it easier to rinse off the dirt before washing.
Surfactants are additives for certain products to lower the surface tension of a liquid. This helps the liquid to mix and combine with another substance, making it easier to combine a mixture of several (types of) substances. This acts as an emulsion, wetting-agent, detergent, foaming agent and/or dispersants. Surfactants combine hydrophobic and hydrophilic properties, which allows them to interact with both types.