Soft washing, pressure washing, and power washing each solve different cleaning problems. Soft washing uses low pressure (under 500 PSI) with cleaning solutions like sodium hypochlorite to kill and lift organic growth, making it safest for delicate or painted surfaces such as roofs and vinyl siding. Pressure washing uses higher pressure (about 1,000 to 4,000 PSI) with cold water to remove dirt mechanically, which suits harder materials like...