A strain washer uses a source of power (either an electrical motor or a gasoline engine) to pressurize water to create an ultra-strong stream of water that can deal with outdoor stains and dirt with extra power and fewer elbow grease than guide cleaning methods. The machine will pressurize water sourced from a standard hose to a delegated quantity of "pounds per sq. inch," or "psi." The high-stress hydro-power is ideal for seasonal cleaning initiatives, but before you get began, brush up on your strain-washing fundamentals.