Pressure washers are equipped with an all-in-one variable spray rod, which allows you to adjust the water pressure with a single turn, or with a set of interchangeable nozzles. It is usually a knob that connects to the water outlet port and the pressure is reduced by turning it clockwise. Lowering the pressure also reduces the volume of the sprayer to turn a powerful sprayer into one that you can safely use to clean windows and other fragile surfaces. Greenworks only manufactures electric pressure washers, but it is one of the biggest companies, with models available at Tractor Supply and Lowe's stores.
Although most can be adjusted and many work in the same basic way, the pressure washer you buy may be different from other models. Pressure washers can reduce cleaning work, which would otherwise be tedious, and can help you go out for a walk in the backyard so you can enjoy it instead of spending all your time cleaning and removing dirt and grime. The tip controls the width of the spray pattern, and a narrow pattern is potentially destructive, especially if pressure is increased. The pump works to expel water at a higher pressure, so that it can remove dirt, buildup, and other debris that may have accumulated on the patio or other surfaces during the winter.
The main danger of pressure washers is the angle and the concentrated intensity of the water being sprayed. For those considering a pressure washer, it's always useful to learn things like the ability to adjust the pressure depending on what they're doing. Kärcher was one of the first manufacturers of electric pressure washers and currently sells models on Amazon and Home Depot. Pressure washers aren't ideal for removing deep stains or for removing things that are deeply ingrained in materials, but they are great for removing surface stains.
Craftsman, which was formerly Sears' own brand, now sells gas and electric pressure washers at Lowe's as well as a small number of Ace Hardware stores. But before launching heavy artillery, remember that all pressure washers should be used with caution. More pressure means that a nozzle placed at a wider angle will clean as well as an electrical model works with a tighter fit. The relief valve adjusts the pressure automatically when you press the nozzle trigger.