Tom Bosley -- who famously played Mr. Cunningham on  Happy Days  -- died this morning at a hospital in Rancho Mirage, CA ...
Average estimates: $250 to $420. Power washers can have pressures of 4,000 psi (pounds per square inch) to lesser pressures of maybe a few hundred and run by gas or electric. This means that professionals will probably use one with less pressure to clean a deck and maybe one with higher pressure to clean a patio.
According to The-Power-Washer-Advisor.com, the average hourly rate for power washing is $100. Less experienced workers will earn less than this rate, sometimes as low as $60 per hour. You can increase your prices as you gain more experience.