This post was created to answer commonly asked questions on what surfaces should be Pressure Washed or Soft Washed. Pressure Wash or Soft Wash Vinyl Siding? Pressure washing machines are too strong and can cause damage to the siding. Soft Washing is the proper way to clean and protect your vinyl siding. Pressure Wash or Soft Wash Aluminum Siding? Soft Washing is the recommended cleaning method for aluminum siding. Soft Washing will clean and kill all algae mold and mildew w