Power washing or pressure washing exterior surfaces costs between $200 and $450. Most companies charge either $0.35 to $0.80 per square foot or $60 to $150 per hour.
Exact prices depend on the surface you want to clean:
Gutters: $55 - $160
Driveway: $130 - $220
Siding: $150 - $400
Deck or Patio: $220 - $450