For a standard two-car driveway, the cost is approximately $150 to $300. Of course, the cost to pressure wash a driveway depends on several factors, including its size, the level of dirt or stains, and regional pricing differences. On average, homeowners can expect to pay between $0.15 to $0.30 per square foot. This translates to the $150 to $300 for a two-car driveway in Phoenix. Contractors that use commercial grade hot water power washer vs a portable cold water unit will generally charge higher prices but also achieve better results. It's advisable to get multiple quotes from local service providers to ensure competitive pricing.