1. Painted, aluminum and wood siding have a soft finish, therefore when regular maintenance cleaning is neglected the beauty and appearance of your home and property suffers. Mold, mildew and pollutants attack the finish of your siding and will do permanent damage. The painted, aluminum and vinyl surfaces should be restored with proper cleaning to bring back that fresh clean appearance to your home and property. 2. Most vinyl siding is builder's grade, therefore when mold, mildew or pollutants are not removed the result is a dull finish.