what psi is needed to clean concrete
Select the appropriate equipment and settings. A gas or electric washer with a pressure rating of at least 3,000 PSI, and a flow rate of at least 4 gallons (15.1 L) per minute, will effectively clean exterior concrete. Set the spray nozzle to high pressure and use a 40-inch spray tip. Add an appropriate cleaning solution to the reservoir. Prep the concrete surface.