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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.
Remove staining, mildew and old finish with a commercial deck cleaning solution. Pressure washing is almost always a must on older decks, but be sure not to use too much pressure. You can damage the wood if it's turned up too high. Usually 1500-2500 PSI is adequate for pressure treated lumber.