You’ve tried water. You’ve tried soap. You’ve tried scrubbing and scouring. You’ve tried nasty chemicals that don’t do what they say. So what do you do when it won’t come clean? Roll out the pressure washer! Many people now routinely use these super-powerful hoses (also known as “power washers”) to blast things clean with water jets pressurized at about 100–200 times the pressure of the air around us (that’s 1500–3000 pounds per square inch or psi). They’re brilliant on patios, drives, lawn furniture, barbecue grills, and all kinds of other outside grime. Let’s take a closer look at how they work!
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