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.
1 Renting a pressure/power washer for the day might cost $60 to $80 depending on the unitâs capacity. 2  An economical washer can be purchased for $75 to $150, although a more powerful machine will cost at least $150 to $300. Paying a professional to power/pressure wash a basic single level deck with around 250 square feet might cost $150 to $250. 2  Larger decks or those requiring heavy cleaning will cost more; a 20 x 20 foot deck might cost $300 to $400. 3  Expect a minimum charge of at least $100.