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Cost breakdown. Labor costs: Bring in a professional pressure washer for cleaning a deck. Pressure washing costs between $60-$100 per hr. An deck of less than 500 sq.ft. will take about 1-2 hours to clean and cost of between $60-$200. Water Costs: The cost of the water in pressure washing is very minimal.
Gas-Powered Pressure Washers. In contrast, gas washers can deliver more than 3,000 psi and are good for cleaning siding, decks and concrete. They can be rented and bought and have accessories added onto them like chemical injectors and longer spray wands. Its estimated they cost anywhere from $300 to $800.