How much psi do you need to clean a house?

For cleaning your house’s driveway, you will need a pressure washer set at between 2,500 and 3,000 psi. If you are cleaning other areas like vinyl siding, decks or glass, the pressure should not be higher than 1,500 psi. For softer materials like softwood, you should use a lower pressure of around 500 to 600 psi.