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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.
Effective deck power washing is anchored on the proper use of the right deck pressure washer and cleaning solutions. It is important that we provide the right amount and proper care and maintenance to our decks. The recommended pressure for washing and cleaning of decks is 1500 -1800 PSI. 2  A hot water power washer is not recommended for decks as hot water will raise the grain severely. 3  A cold water power washer is the appropriate cleaning and maintenance solution for decks.