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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.
Pressure Washing Costs. 1  Paying a professional to power/pressure wash a basic single level deck with around 250 square feet might cost $150 to $250. 2  Larger decks or those requiring heavy cleaning will cost more; a 20 x 20 foot deck might cost $300 to $400.3  Expect a minimum charge of at least $100. Expect a minimum charge of at least $100. 2  Renting a pressure/power washer for the day might cost $60 to $80 depending on the unitâs capacity. 3  An economical washer can be purchased for $75 to $150, although a more powerful machine will cost at least $150 to $300. 4  Professional grade washers cost $1,000 to $3,000 or more.