First off, let me say that there is a definite place for both soft washing and power washing. In making a choice, it all depends on what you are having cleaned. Concrete can take the pressure, but vinyl siding can not.
Power washing uses a high pressure sprayer to force water on to a surface thereby propelling dirt and grime off of the surface. Pressure washing can use a force between 200 psi to over 2000 psi. The amount of pressure used would be dependant on the surface. This method is commonly used for brick, concrete, and even wood in some cases.
Soft washing is less abrasive than power washing. It uses chemicals and detergents to eat away at the staining and dirt that has accumulated. After these have been applied, a gentle wash down with a low-pressure spray will clean everything right up. This method is commonly used on house siding, roofs, and sensitive materials.
Envirowash is your Virginia soft washing contractor; we can handle all your pressure washing needs.