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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.
1 Power Washing, Stain and Seal : $1.00-$2.00 per square foot depending on surface condition, intended outcome (mold/mildew issues), and access. 2  Power washing a deck is good for cleaning the surface but Never use the aggressive pressure of the water as the cleaning factor.